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 A248902 #9 Nov 28 2020 06:35:50
%S A248902 6,7,8,10,19,21,23,24,28,33,72,80,270,271,323,404,2058,4118,5986,7118,
%T A248902 13387,16041,20164,30024,30025,76955,151818,622213,1012549,2482211,
%U A248902 2482212,6330859,9988608,14984623,105181797,180589455
%N A248902 Numbers k such that A248891(k) = 2.
%C A248902 If k is in {6, 7, 23, 270, 30024, 2482211, ...} then both numbers k and k+1 are in the sequence. It seems that this set has more members.
%Y A248902 Cf. A001359, A248891, A248901.
%K A248902 nonn,more
%O A248902 1,1
%A A248902 _Jahangeer Kholdi_ and _Farideh Firoozbakht_, Nov 22 2014
%E A248902 a(27)-a(36) from _Jinyuan Wang_, Nov 28 2020