This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A195439 #32 Aug 03 2014 14:27:53 %S A195439 3,5,7,8,10,16,23,26,32,37,64,89,149,173,251,307,317,956,30197,46058 %N A195439 Numbers n such that 16^n + 1 is a semiprime. %t A195439 Select[Range[37], PrimeOmega[16^# + 1] == 2 &] (* _Arkadiusz Wesolowski_, Dec 15 2011 *) %Y A195439 Cf. A002590, A057182, A127317. %K A195439 nonn %O A195439 1,1 %A A195439 _Arkadiusz Wesolowski_, Oct 19 2011