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 A353300 #12 Apr 11 2022 12:57:14
%S A353300 3,4,5,6,8,9,11,12,13,14,15,16,19,20,24,25,26,30,32,41,47,48,49,51,57,
%T A353300 59,76,82,83,92,104,105,117,119,131,134,137,139,143,154,166,170,172,
%U A353300 180,209,214,215,216,217,227,231,234,247,265,269,271,284,317,327,348
%N A353300 Numbers k such that A004394(k)-1 is prime.
%C A353300 First differs from A306588 at n=15.
%H A353300 Amiram Eldar, <a href="/A353300/b353300.txt">Table of n, a(n) for n = 1..314</a>
%e A353300 3 is a term since A004394(3)-1 = 4-1 = 3 is prime.
%t A353300 s = {}; abm = 0; k = 0; Do[ab = DivisorSigma[-1, n]; If[ab > abm, abm = ab; k++; If[PrimeQ[n - 1], AppendTo[s, k]]], {n, 1, 10^6}]; s
%Y A353300 Cf. A004394, A072826, A306588, A353301, A353302.
%K A353300 nonn
%O A353300 1,1
%A A353300 _Amiram Eldar_, Apr 10 2022