factor, primes – factor a number, generate large primes|
factor [ number ] |
primes start [ finish ]
Factor prints number and its prime factors, each repeated the
proper number of times. The number must be positive and less than
254 (about 1.8×1016). |
If no number is given, factor reads a stream of numbers from the standard input and factors them. It exits on any input not a positive integer. Maximum running time is proportional to -/n .
Primes prints the prime numbers ranging from start to finish,
where start and finish are positive numbers less than 256. If
finish is missing, primes prints without end; if start is missing,
it reads the starting number from the standard input.