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ntheory(3)	      User Contributed Perl Documentation	    ntheory(3)

NAME
       ntheory - Number	theory utilities

SEE
       See Math::Prime::Util for complete documentation.

QUICK REFERENCE
       Tags:
	 :all	      to import	almost all functions
	 :rand	      to import	rand, srand, irand, irand64

   PRIMALITY
	 is_prob_prime(n)		     primality test (BPSW)
	 is_prime(n)			     primality test (BPSW + extra)
	 is_provable_prime(n)		     primality test with proof
	 is_provable_prime_with_cert(n)	     primality test: (isprime,cert)
	 prime_certificate(n)		     as	above with just	certificate
	 verify_prime(cert)		     verify a primality	certificate
	 is_mersenne_prime(p)		     is	2^p-1 prime or composite
	 is_aks_prime(n)		     AKS deterministic test (slow)
	 is_ramanujan_prime(n)		     is	n a Ramanujan prime

   PROBABLE PRIME TESTS
	 is_pseudoprime(n,bases)		  Fermat probable prime	test
	 is_euler_pseudoprime(n,bases)		  Euler	test to	bases
	 is_euler_plumb_pseudoprime(n)		  Euler	Criterion test
	 is_strong_pseudoprime(n,bases)		  Miller-Rabin test to bases
	 is_lucas_pseudoprime(n)		  Lucas	test
	 is_strong_lucas_pseudoprime(n)		  strong Lucas test
	 is_almost_extra_strong_lucas_pseudoprime(n, [incr])   AES Lucas test
	 is_extra_strong_lucas_pseudoprime(n)	  extra	strong Lucas test
	 is_frobenius_pseudoprime(n, [a,b])	  Frobenius quadratic test
	 is_frobenius_underwood_pseudoprime(n)	  combined PSP and Lucas
	 is_frobenius_khashin_pseudoprime(n)	  Khashin's 2013 Frobenius test
	 is_perrin_pseudoprime(n [,r])		  Perrin test
	 is_catalan_pseudoprime(n)		  Catalan test
	 is_bpsw_prime(n)			  combined SPSP-2 and ES Lucas
	 miller_rabin_random(n,	ntests)		  perform random-base MR tests

   PRIMES
	 primes([start,] end)		     array ref of primes
	 twin_primes([start,] end)	     array ref of twin primes
	 semi_primes([start,] end)	     array ref of semiprimes
	 ramanujan_primes([start,] end)	     array ref of Ramanujan primes
	 sieve_prime_cluster(start, end, @C) list of prime k-tuples
	 sieve_range(n,	width, depth)	     sieve out small factors to	depth
	 next_prime(n)			     next prime	> n
	 prev_prime(n)			     previous prime < n
	 prime_count(n)			     count of primes <=	n
	 prime_count(start, end)	     count of primes in	range
	 prime_count_lower(n)		     fast lower	bound for prime	count
	 prime_count_upper(n)		     fast upper	bound for prime	count
	 prime_count_approx(n)		     fast approximate count of primes
	 nth_prime(n)			     the nth prime (n=1	returns	2)
	 nth_prime_lower(n)		     fast lower	bound for nth prime
	 nth_prime_upper(n)		     fast upper	bound for nth prime
	 nth_prime_approx(n)		     fast approximate nth prime
	 twin_prime_count(n)		     count of twin primes <= n
	 twin_prime_count(start, end)	     count of twin primes in range
	 twin_prime_count_approx(n)	     fast approx count of twin primes
	 nth_twin_prime(n)		     the nth twin prime	(n=1 returns 3)
	 nth_twin_prime_approx(n)	     fast approximate nth twin prime
	 semiprime_count(n)		     count of semiprimes <= n
	 semiprime_count(start,	end)	     count of semiprimes in range
	 semiprime_count_approx(n)	     fast approximate count of semiprimes
	 nth_semiprime(n)		     the nth semiprime
	 nth_semiprime_approx(n)	     fast approximate nth semiprime
	 ramanujan_prime_count(n)	     count of Ramanujan	primes <= n
	 ramanujan_prime_count(start, end)   count of Ramanujan	primes in range
	 ramanujan_prime_count_lower(n)	     fast lower	bound for Ramanujan count
	 ramanujan_prime_count_upper(n)	     fast upper	bound for Ramanujan count
	 ramanujan_prime_count_approx(n)     fast approximate Ramanujan	count
	 nth_ramanujan_prime(n)		     the nth Ramanujan prime (Rn)
	 nth_ramanujan_prime_lower(n)	     fast lower	bound for Rn
	 nth_ramanujan_prime_upper(n)	     fast upper	bound for Rn
	 nth_ramanujan_prime_approx(n)	     fast approximate Rn
	 legendre_phi(n,a)		     # below n not div by first	a primes
	 inverse_li(n)			     integer inverse logarithmic integral
	 prime_precalc(n)		     precalculate primes to n
	 sum_primes([start,] end)	     return summation of primes	in range
	 print_primes(start,end[,fd])	     print primes to stdout or fd

   FACTORING
	 factor(n)			     array of prime factors of n
	 factor_exp(n)			     array of [p,k] factors p^k
	 divisors(n)			     array of divisors of n
	 divisor_sum(n)			     sum of divisors
	 divisor_sum(n,k)		     sum of k-th power of divisors
	 divisor_sum(n,sub{...})	     sum of code run for each divisor
	 znlog(a, g, p)			     solve k in	a = g^k	mod p

   ITERATORS
	 forprimes { ... } [start,] end	     loop over primes in range
	 forcomposites { ... } [start,]	end  loop over composites in range
	 foroddcomposites {...}	[start,] end loop over odd composites in range
	 forsemiprimes {...} [start,] end    loop over semiprimes in range
	 forfactored {...} [start,] end	     loop with factors
	 forsquarefree {...} [start,] end    loop with factors of square-free n
	 fordivisors { ... } n		     loop over the divisors of n
	 forpart { ... } n [,{...}]	     loop over integer partitions
	 forcomp { ... } n [,{...}]	     loop over integer compositions
	 forcomb { ... } n, k		     loop over combinations
	 forperm { ... } n		     loop over permutations
	 formultiperm {	... } \@n	     loop over multiset	permutations
	 forderange { ... } n		     loop over derangements
	 forsetproduct { ... } \@a[,...]     loop over Cartesian product of lists
	 prime_iterator			     returns a simple prime iterator
	 prime_iterator_object		     returns a prime iterator object
	 lastfor			     stop iteration of for.... loop

   RANDOM NUMBERS
	 irand				     random 32-bit integer
	 irand64			     random 64-bit integer
	 drand([limit])			     random NV in [0,1)	or [0,limit)
	 random_bytes(n)		     string with n random bytes
	 entropy_bytes(n)		     string with n entropy-source bytes
	 urandomb(n)			     random integer less than 2^n
	 urandomm(n)			     random integer less than n
	 csrand(data)			     seed the CSPRNG with binary data
	 srand([seed])			     simple seed (exported with	:rand)
	 rand([limit])			     alias for drand (exported with :rand)
	 random_factored_integer(n)	     random [1..n] and array ref of factors

   RANDOM PRIMES
	 random_prime([start,] end)	     random prime in a range
	 random_ndigit_prime(n)		     random prime with n digits
	 random_nbit_prime(n)		     random prime with n bits
	 random_strong_prime(n)		     random strong prime with n	bits
	 random_proven_prime(n)		     random n-bit prime	with proof
	 random_proven_prime_with_cert(n)    as	above and include certificate
	 random_maurer_prime(n)		     random n-bit prime	w/ Maurer's alg.
	 random_maurer_prime_with_cert(n)    as	above and include certificate
	 random_shawe_taylor_prime(n)	     random n-bit prime	with S-T alg.
	 random_shawe_taylor_prime_with_cert(n)	as above including certificate
	 random_unrestricted_semiprime(n)    random n-bit semiprime
	 random_semiprime(n)		     as	above with equal size factors

   LISTS
	 vecsum(@list)			     integer sum of list
	 vecprod(@list)			     integer product of	list
	 vecmin(@list)			     minimum of	list of	integers
	 vecmax(@list)			     maximum of	list of	integers
	 vecextract(\@list, mask)	     select from list based on mask
	 vecreduce { ... } @list	     reduce / left fold	applied	to list
	 vecall	{ ... }	@list		     return true if all	are true
	 vecany	{ ... }	@list		     return true if any	are true
	 vecnone { ... } @list		     return true if none are true
	 vecnotall { ... } @list	     return true if not	all are	true
	 vecfirst { ...	} @list		     return first value	that evals true
	 vecfirstidx { ... } @list	     return first index	that evals true

   MATH
	 todigits(n[,base[,len]])	     convert n to digit	array in base
	 todigitstring(n[,base[,len]])	     convert n to string in base
	 fromdigits(\@d,[,base])	     convert base digit	vector to number
	 fromdigits(str,[,base])	     convert base digit	string to number
	 sumdigits(n)			     sum of digits, with optional base
	 is_square(n)			     return 1 if n is a	perfect	square
	 is_power(n)			     return k if n = c^k for integer c
	 is_power(n,k)			     return 1 if n = c^k for integer c,	k
	 is_power(n,k,\$root)		     as	above but also set $root to c.
	 is_prime_power(n)		     return k if n = p^k for prime p
	 is_prime_power(n,\$p)		     as	above but also set $p to p
	 is_square_free(n)		     return true if no repeated	factors
	 is_carmichael(n)		     is	n a Carmichael number
	 is_quasi_carmichael(n)		     is	n a quasi-Carmichael number
	 is_primitive_root(r,n)		     is	r a primitive root mod n
	 is_pillai(n)			     v where  v! % n ==	n-1  and  n % v	!= 1
	 is_semiprime(n)		     does n have exactly 2 prime factors
	 is_polygonal(n,k)		     is	n a k-polygonal	number
	 is_polygonal(n,k,\$root)	     as	above but also set $root
	 is_fundamental(d)		     is	d a fundamental	discriminant
	 is_totient(n)			     is	n = euler_phi(x) for some x
	 sqrtint(n)			     integer square root
	 rootint(n,k)			     integer k-th root
	 rootint(n,k,\$rk)		     as	above but also set $rk to r^k
	 logint(n,b)			     integer logarithm
	 logint(n,b,\$be)		     as	above but also set $be to b^e.
	 gcd(@list)			     greatest common divisor
	 lcm(@list)			     least common multiple
	 gcdext(x,y)			     return (u,v,d) where u*x+v*y=d
	 chinese([a,mod1],[b,mod2],...)	     Chinese Remainder Theorem
	 primorial(n)			     product of	primes below n
	 pn_primorial(n)		     product of	first n	primes
	 factorial(n)			     product of	first n	integers: n!
	 factorialmod(n,m)		     factorial mod m
	 binomial(n,k)			     binomial coefficient
	 partitions(n)			     number of integer partitions
	 valuation(n,k)			     number of times n is divisible by k
	 hammingweight(n)		     population	count (# of binary 1s)
	 kronecker(a,b)			     Kronecker (Jacobi)	symbol
	 addmod(a,b,n)			     a + b mod n
	 mulmod(a,b,n)			     a * b mod n
	 divmod(a,b,n)			     a / b mod n
	 powmod(a,b,n)			     a ^ b mod n
	 invmod(a,n)			     inverse of	a modulo n
	 sqrtmod(a,n)			     modular square root
	 moebius(n)			     Moebius function of n
	 moebius(beg, end)		     array of Moebius in range
	 mertens(n)			     sum of Moebius for	1 to n
	 euler_phi(n)			     Euler totient of n
	 euler_phi(beg,	end)		     Euler totient for a range
	 inverse_totient(n)		     image of Euler totient
	 jordan_totient(n,k)		     Jordan's totient
	 carmichael_lambda(n)		     Carmichael's Lambda function
	 ramanujan_sum(k,n)		     Ramanujan's sum
	 exp_mangoldt			     exponential of Mangoldt function
	 liouville(n)			     Liouville function
	 znorder(a,n)			     multiplicative order of a mod n
	 znprimroot(n)			     smallest primitive	root
	 chebyshev_theta(n)		     first Chebyshev function
	 chebyshev_psi(n)		     second Chebyshev function
	 hclassno(n)			     Hurwitz class number H(n) * 12
	 ramanujan_tau(n)		     Ramanujan's Tau function
	 consecutive_integer_lcm(n)	     lcm(1 .. n)
	 lucasu(P, Q, k)		     U_k for Lucas(P,Q)
	 lucasv(P, Q, k)		     V_k for Lucas(P,Q)
	 lucas_sequence(n, P, Q, k)	     (U_k,V_k,Q_k) for Lucas(P,Q) mod n
	 bernfrac(n)			     Bernoulli number as (num,den)
	 bernreal(n)			     Bernoulli number as BigFloat
	 harmfrac(n)			     Harmonic number as	(num,den)
	 harmreal(n)			     Harmonic number as	BigFloat
	 stirling(n,m,[type])		     Stirling numbers of 1st or	2nd type
	 numtoperm(n,k)			     kth lexico	permutation of n elems
	 permtonum([a,b,...])		     permutation number	of given perm
	 randperm(n,[k])		     random permutation	of n elems
	 shuffle(...)			     random permutation	of an array

   NON-INTEGER MATH
	 ExponentialIntegral(x)		     Ei(x)
	 LogarithmicIntegral(x)		     li(x)
	 RiemannZeta(x)			     I<paragraph>(s)-1,	real-valued Riemann Zeta
	 RiemannR(x)			     Riemann's R function
	 LambertW(k)			     Lambert W:	solve for W in k = W exp(W)
	 Pi([n])			     The constant I (NV	or n digits)

   SUPPORT
	 prime_get_config		     gets hash ref of current settings
	 prime_set_config(%hash)	     sets parameters
	 prime_memfree			     frees any cached memory

COPYRIGHT
       Copyright 2011-2018 by Dana Jacobsen <dana@acm.org>

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

perl v5.32.1			  2018-11-15			    ntheory(3)

NAME | SEE | QUICK REFERENCE | COPYRIGHT

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