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 A248903 #9 Nov 28 2020 06:35:33
%S A248903 9,12,15,17,18,22,27,32,34,39,69,70,71,79,128,143,172,226,241,242,248,
%T A248903 269,322,325,403,405,406,420,745,2057,2272,2606,2607,3339,3340,3562,
%U A248903 4116,4117,4446,5985,6834,7116,7117,7490,7669,13386,13388,15148,15149,15150
%N A248903 Numbers k such that A248891(k) = 3.
%C A248903 Sequence A248894 gives terms a(n) such that a(n+1)=a(n)+1.
%H A248903 Jinyuan Wang, <a href="/A248903/b248903.txt">Table of n, a(n) for n = 1..162</a>
%o A248903 (PARI) lista(nn) = {my(c=q=0, r, v=List([3, 5, 11, 17])); forprime(p=19, nn, if(p-2==q, listput(v,q); if((t=v[c++]^(1+1/c))>v[c+3] && t<v[c+4], print1(c, ", "))); q=p); } \\ _Jinyuan Wang_, Nov 28 2020
%Y A248903 Cf. A001359, A248891, A248894, A248901, A248902.
%K A248903 nonn
%O A248903 1,1
%A A248903 _Jahangeer Kholdi_ and _Farideh Firoozbakht_, Nov 22 2014