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 A085913 #14 Nov 28 2018 09:32:30
%S A085913 1,2,3,5,9,13,19,25,33,41,51,61,73,85,99,113,129,145,163,181,201,221,
%T A085913 243,265,289,313,339,365,393,421,451,481,513,545,579,613,649,685,723,
%U A085913 761,801,841,883,925,969,1013,1059,1105,1153,1201,1251,1301,1353,1405
%N A085913 Group the natural numbers such that the product of the terms of the n-th group is divisible by n!. (1),(2),(3,4),(5,6,7,8),(9,10,11,12),(13,14,15,16,17,18),(19,20,21,22,23,24),... Sequence contains the first term of every group.
%C A085913 Differs from A099392 at n = 61.
%t A085913 i = 1; Table[p = i; s = i; While[!Divisible[p *= i++, n!]]; s, {n, 1, 54}] (* _Jon Maiga_, Nov 28 2018 *)
%Y A085913 Cf. A085912, A085914, A085915.
%K A085913 nonn
%O A085913 1,2
%A A085913 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 10 2003
%E A085913 More terms from _Ray Chandler_, Sep 15 2003