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 A144728 #15 Jun 19 2021 12:53:35
%S A144728 1,2,3,5,9,12,16,22,25,29,31,35,47,57,61,66,79,81,108,114,148,163,172,
%T A144728 185,198,203,205,236,265,275,282,294,312,344,359,377,397,398,411,427,
%U A144728 431,493,512,589,647,648,660,708,719,765,887,911,916,935,1062,1093,1102
%N A144728 a(n) is the smallest positive integer such that b * (Product_{k=1..n} a(k)) + 1 is prime, with a(n) > a(n-1) for n >= 2, and b = 6.
%t A144728 k = 6; a = {}; Do[If[PrimeQ[k n + 1], k = k n; AppendTo[a, n]], {n, 1, 3000}]; a
%Y A144728 Cf. A046966, A046972, A144717, A144718, A144722, A144723, A144724, A144725, A144726, A144727, A144729, A144730, A144731.
%K A144728 nonn
%O A144728 1,2
%A A144728 _Artur Jasinski_, Sep 19 2008
%E A144728 Definition corrected by _Georg Fischer_, Jun 18 2021