%I
%S 1,1,2,7,13,35,71,147,298,622,1270,2558,5257,10509,21297,42852,86258,
%T 173528,348187,699590,1404936,2818606,5657411,11345622,22746823
%N Write the primes in binary; a(n) = total number of 0's in those which have an nbit expansion.
%e a(2) = 1: 2 = 10 and 3 = 11, with a total of one 0.
%e a(3) = 1: 5 = 101, 7 = 111, again with just one 0.
%o (PARI) a(n) = {nb = 0; for (i=2^(n1), 2^n1, if (isprime(i), nb += n  norml2(binary(i)));); return (nb);} \\ _Michel Marcus_, Jun 20 2013
%Y Cf. A168156.
%K base,nonn
%O 2,3
%A Jacob Woolcutt (woolcutt(AT)uiuc.edu), Sep 19 2003
