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 A287634 #15 May 31 2017 08:18:40 %S A287634 1,324,1296,1858,2630,2814,3451,4905,6366,7258,7322,8754,8966,9980, %T A287634 10655,10779,10909,11881,12248,13609,13917,14769,14904,16502,17281, %U A287634 17303,18923,18943,19598,19852,20284,21342,21904,22012,24367,25425,25814,27607,27908,28729 %N A287634 Ulam numbers k such that 4*k and 16*k are also Ulam numbers. %Y A287634 Cf. A002858, A287612. %K A287634 nonn %O A287634 1,2 %A A287634 _Enrique Navarrete_, May 28 2017 %E A287634 a(11)-a(40) from _Giovanni Resta_, May 31 2017