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/usr/lib/s9fes/help/sieve is in scheme9 2010.11.13-2.

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S9 LIB  (sieve integer)  ==>  list

Given an INTEGER N, generate a list of all prime numbers less
than N. INTEGER must be positive.

(sieve 20)  ==>  (2 3 5 7 11 13 17 19)