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 A167856 #16 Aug 21 2021 05:25:33 %S A167856 2,4,6,10,12,18,20,24,30,42,60,84,120,140,168,180,210,330,390,420,630, %T A167856 660,780,840,1260,1680,1848,1980,2310,2730,3570,3990,4290,4620,5460, %U A167856 6930,7140,7980,8190,8580,9240,10920,13860,16380,18480,21420,23940,25740,27720 %N A167856 Indices of records in A167401. %Y A167856 Cf. A167401. %K A167856 nonn %O A167856 1,1 %A A167856 _J. Lowell_, Nov 13 2009 %E A167856 a(12) from _R. J. Mathar_, Apr 28 2010 %E A167856 a(13)-a(41) from _Rémy Sigrist_, Jun 03 2019 %E A167856 a(42)-a(49) from _Jinyuan Wang_, Aug 21 2021