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%I #2 Apr 30 2014 01:27:40
%S 1,2,4,2,10,4,16,2,22,28,10,4,40,14,46,52,58,20,22,70,8,26,82,88,32,
%T 100,34,106,4,112,14,130,136,46,148,50,52,2,166,172,178,20,190,64,196,
%U 22,70,74,226,76,232,238,80,250,256,262,268,10,92,280,94,292,34,310
%N Remove all 3s from prime(n) - 1.
%o (PARI) a(n) = (prime(n)-1)/3^valuation(prime(n)-1,3)
%Y Equals A038502( A006093(n) ). prime(n)-1 = a(n) * 3^A099584(n).
%Y Cf. A057023.
%K nonn
%O 1,2
%A _Ralf Stephan_, Oct 24 2004
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