Resources in programs : large arithmetic 

Primes
 Primes is a search tool for prime numbers. It allows you to search primes in different manners, and can generate primes of up to 200 digits (or more).
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(Added: 2Oct2000 Hits: 12312 Rating: 6.53 Votes: 23) Rate It

factor.exe
 This small program factors small numbers (up to 80 digits) and checks for primality. It is presented as an example of what can be done with
its author's MIRACL C/C++ library for cryptography system implementors.
(Added: 3Aug2000 Hits: 4785 Rating: 8.43 Votes: 14) Rate It

Factoris
 This page factors a number (or formula) into its irreducible or prime factors.
There is no limit on the values, but the execution time is limited (to about 20 seconds).
The formula may be an integer, a rational number, a polynomial or a rational function.
(Added: 2Oct2000 Hits: 5133 Rating: 7.56 Votes: 9) Rate It

Fast arithmetic
 Fast arithmetic package, Zmult.
Benchmarks for many integer multiplication packages. Mailing list for implementors of fast arithmetic systems.
(Added: 4Aug2000 Hits: 4328 Rating: 0 Votes: 0) Rate It

GNU MP
 GMP is a free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. GMP has a rich set of functions, and the functions have a regular interface.
(Added: 15Nov2000 Hits: 4589 Rating: 9.33 Votes: 12) Rate It

Largeinteger arithmetic in BASIC
 BASIC library for largeinteger arithmetic plus some number theory modules, including (pseudo)primetests and factorization.
(Added: 15Sep2005 Hits: 2815 Rating: 8.75 Votes: 4) Rate It

NTL: A Library for doing Number Theory
 NTL is a highperformance, portable C library providing data structures and algorithms for manipulating signed, arbitrary length integers, and for vectors, matrices, and polynomials over the integers and over finite fields.
(Added: 15Nov2000 Hits: 3746 Rating: 8.33 Votes: 3) Rate It

Pari  a system for doing number theory
 PARIGP is a software package for computeraided number theory. It consists of a C library, libpari (with optional assembler cores for some popular architectures), and of the programmable interactive gp calculator.
An extensive free program.
(Added: 3Aug2000 Hits: 4137 Rating: 9.10 Votes: 9) Rate It

UBASIC
 This is a version of BASIC which allows use of rational numbers and
integers up to 2600 digits. Various number theoretic functions built in
including the SQUFO, MPQS, and ECM factoring methods; as well as the APRTCL
primality proving algorithm. (MSDOS) You might find a newer version here
(Added: 3Aug2000 Hits: 5495 Rating: 8.40 Votes: 15) Rate It
 