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 A287746 #14 Feb 20 2020 15:42:38 %S A287746 1,5,5,2,7,15,11,4,13,25,17,6,19,35,23,8,25,45,29,10,31,55,35,12,37, %T A287746 65,41,14,43,75,47,16,49,85,53,18,55,95,59,20,61,105,65,22,67,115,71, %U A287746 24,73,125,77,26,79,135,83,28,85,145,89,30,91,155,95,32,97,165,101,34,103,175 %N A287746 First differences of A154293. %F A287746 a(n) = A287733(n)/6. %t A287746 Select[Accumulate[Range[0,300]]/6,IntegerQ]//Differences (* _Harvey P. Dale_, Feb 20 2020 *) %Y A287746 Cf. A069497, A108782, A154293, A287733. %K A287746 nonn %O A287746 1,2 %A A287746 _Greg Huber_, May 31 2017