Prime math magic answer.

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-- Lucius L. Hilley III  --       lhilley at cdc.net       --
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-- Hollow Horse Software -- http://www.cdc.net/~lhilley --
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I thought about the code I had previously examined.
RDS's sieve is multiplying by 2 so that only the odd
numbers are filtered. 2 is the only even number that is
prime.  All other prime numbers are odd.

Exactly half the sieving is skipped/eliminated.
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