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 A158910 #7 May 19 2018 09:15:46 %S A158910 18,18,18,54,18,18,18,72,18,36,18,36,36,18,18,72,18,54,36,18,36,90,18, %T A158910 36,90,54,36,36,18,18,54,90,36,54,18,18,54,36,18,54,18,54,18,36,90,36, %U A158910 54,36,54,36,18,18,54,36,72,18,108,36,36,72,18,18,126,36,54,54,54,36,126 %N A158910 First Differences of A061240. %C A158910 Since A061240 contains prime numbers of the form 9k+5, k even, all numbers here are multiples of 18. %H A158910 Harvey P. Dale, <a href="/A158910/b158910.txt">Table of n, a(n) for n = 1..1000</a> %t A158910 Differences[Select[Prime[Range[500]],Mod[#,9]==5&]] (* _Harvey P. Dale_, May 19 2018 *) %Y A158910 Cf. A008600. %K A158910 nonn,less %O A158910 1,1 %A A158910 _Paul Curtz_, Mar 30 2009 %E A158910 Edited and extended by _R. J. Mathar_, Apr 03 2009