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 A071941 #2 Mar 30 2012 17:30:44 %S A071941 1,4,6,8,9,10,14,15,16,20,21,22,24,26,27,28,30,32,33,34,35,38,39,40, %T A071941 44,46,49,50,51,52,54,56,57,58,60,62,63,64,65,66,68,69,70,72,74,75,76, %U A071941 77,78,81,82,84,85,86,87,88,90,92,93,94,96,102,104,105,106,111,114,115 %N A071941 Nonprimes for which floor(2^n/n) is even. %t A071941 Select[ Range[120], EvenQ[ Floor[2^# / # ]] && !PrimeQ[ # ] & ] %Y A071941 Cf. A071354. %K A071941 nonn %O A071941 1,2 %A A071941 _Robert G. Wilson v_, Jun 15 2002