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%I #7 Apr 14 2015 09:56:38
%S 2,4,8,6,10,16,21,19,23,40,38,32,42,44,48,54,60,62,68,80,78,72,91,111,
%T 114,88,86,120,118,130,137,133,150,152,168,162,97,192,188,182,176,186,
%U 160,215,280,291,122,226,222,220,240,263,275,300,245,277,329,257
%N Indices of primes in A166133.
%H Reinhard Zumkeller and Ray Chandler, <a href="/A256561/b256561.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Reinhard Zumkeller)
%F a(n) = A255833(A000040(n)). - _Ray Chandler_, Apr 14 2015
%o (Haskell)
%o a256561 = (+ 1) . fromJust . (`elemIndex` a166133_list) . a000040
%Y Cf. A166133, A256563, A255833, A000040.
%K nonn
%O 1,1
%A _Reinhard Zumkeller_, Apr 02 2015