Adleman–Pomerance–Rumely primality test

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In computational number theory, the Adleman–Pomerance–Rumely primality test is an algorithm for determining whether a number is prime. Unlike other, more efficient algorithms for this purpose, it avoids the use of random numbers, so it is a deterministic primality test. It is named after its discoverers, Leonard Adleman, Carl Pomerance, and Robert Rumely. The test involves arithmetic in cyclotomic fields.

It was later improved by Henri Cohen and Hendrik Willem Lenstra and called APRT-CL (or APRCL). It is often used with UBASIC under the name APRT-CLE (APRT-CL extended) and can test primality of an integer n in time:

O((\ln n)^{c\,\ln\,\ln\,\ln n}).

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