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%I #4 Apr 29 2015 16:06:43
%S 1,2,3,4,5,6,8,9,10,11,12,13,14,15,17,18,19,20,22,23,25,27,30,31,34,
%T 35,38,42,45,47,48,49,52,53,54,60,61,63,64,66,69,70,71,73,74,81,83,85,
%U 87,89,92,94,97,100,102,108,112,114,116,117,120,125,127,128
%N Indices of prime powers in A257339.
%C A010055(a(n)) = 1.
%H Reinhard Zumkeller, <a href="/A257458/b257458.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a257458 n = a257458_list !! (n-1)
%o a257458_list = filter ((== 1) . a010055 . a257339) [1..]
%Y Cf. A257339, A010055, A257457.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Apr 24 2015
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