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%I #6 Mar 30 2012 18:54:36
%S 0,2,3,4,5,12,15,19,21,24,26,30,31,32,33,37,38,40,42,43,44,47,48,49,
%T 50,51,52,53,54,60,61,68,69,71,73,74,78,79,80,82,84,85,87,90,94,103,
%U 107,110,111,115,117,120,124,127,136,140,141,142,143,144,145,146,147,150,156,157
%N The set N of numbers such that each positive integer can be written in the form p + n, where p is 0 or a prime and n in N, in an even number of ways.
%F The terms are the exponents in the expansion of 1/S read mod 2 where S = 1 + Sum_{p prime} x^p.
%Y Cf. A108345, A132229.
%K nonn
%O 1,2
%A _Nadia Heninger_ and _N. J. A. Sloane_, Dec 16 2007
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