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 A090811 #4 Oct 24 2018 15:21:49 %S A090811 1,2,3,4,5,6,8,10,12,14,9,20,7,18,22,30,16,26,28,24,32,17,34,36,44,42, %T A090811 27,40,52,48,38,72,50,62,54,60,58,15,46,56,64,29,68,86,66,70,78,76,82, %U A090811 96,112,100,74,90,84,114,21,80,88,98,92 %N A090811 Next new gap between successive prime powers. %t A090811 DeleteDuplicates[Differences[Select[Range[1000000],PrimePowerQ]]] (* _Harvey P. Dale_, Oct 21 2018 *) %Y A090811 Cf. A000961, A014320. %K A090811 easy,nonn %O A090811 1,2 %A A090811 _Naohiro Nomoto_, Feb 11 2004