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 A239522 #4 Apr 12 2014 16:26:22 %S A239522 1,4,16,25,27,32,81,125,128,169,243,256,512,529,2048,7921,8192,32761, %T A239522 32768,130321,131072,134689,524288,2093809,2097152,8388608,8392609, %U A239522 134217728,134258569,536870912,536987929,8590138489,140737625897521,562949953421312,562950076511761 %N A239522 Prime powers (A025475) such that the distance to the nearest prime power is a prime. %Y A239522 Cf. A025475, A239520 - A239523. %K A239522 nonn %O A239522 1,2 %A A239522 _Alex Ratushnyak_, Mar 20 2014