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 A231630 #8 Apr 10 2021 06:02:13
%S A231630 221355125,221355127,402640539,402640541,668862579,668862581,
%T A231630 739577139,739577141
%N A231630 Smallest sets of 8 consecutive deficient numbers in arithmetic progression. The initial deficient number is listed.
%e A231630 221355125, 221355127, 221355129, 221355131, 221355133, 221355135, 221355137, 221355139 is the smallest set of 8 consecutive deficient numbers in arithmetic progression so 221355125 is in the list.
%t A231630 DefQ[n_] := DivisorSigma[1, n] < 2 n; m = 2; z1 = 2; cd = 1; a = {}; Do[If[DefQ[n], If[n - z1 == cd, m = m + 1; If[m > 7, AppendTo[a, n - 7*cd]], m = 2; cd = n - z1]; z1 = n], {n, 3, 1000000000}]; a
%Y A231630 Cf. A005100, A231623, A228965, A231624, A231625, A231626, A231628, A231629.
%K A231630 nonn
%O A231630 1,1
%A A231630 _Shyam Sunder Gupta_, Nov 11 2013