A176507 - OEIS

%I #3 Mar 30 2012 18:52:40

%S 1,31,52,69,78,101,120,127,137,149,177,199,206,248,259,266,277,339,

%T 359,375,406,416,426,429,452,479,501,518,540,551,579,590,603,613,623,

%U 630,640,655,662,676,704,726,732,743,757,775,795,809,816,829,837,847,900

%N Indices of products of 2 single (or isolated or non-twin) primes in the composites.

%F A002808(k)=A176312(a(n)).

%K nonn

%O 1,2

%A _Juri-Stepan Gerasimov_, Apr 19 2010

%E Corrected (553 replaced by 551) by _R. J. Mathar_, May 02 2010