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A176656 The positions of single (or isolated or non-twin) primes in A000040. 3


%S 1,9,12,15,16,19,22,23,24,25,30,31,32,37,38,39,40,47,48,51,54,55,56,

%T 59,62,63,66,67,68,71,72,73,74,75,76,77,78,79,80,85,86,87,88,91,92,93,

%U 94,95,96,97,100,101,102,103,106,107,108,111,112,115,118,119,122,123,124

%N The positions of single (or isolated or non-twin) primes in A000040.

%F A000040(a(n))=A007510(k).

%p A176656 := proc(n) numtheory[pi](A007510(n)) ; end proc: seq(A176656(n),n=1..120) ; # _R. J. Mathar_, Apr 26 2010

%K nonn

%O 1,2

%A _Juri-Stepan Gerasimov_, Apr 23 2010

%E Corrected (32 inserted, one of the 94 removed, 103 inserted, 121 replaced by 122) by _R. J. Mathar_, Apr 26 2010

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Last modified December 8 08:49 EST 2019. Contains 329862 sequences. (Running on oeis4.)