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 A139197 #8 Apr 10 2019 16:13:33
%S A139197 559,4435199,691891199,39520825343999,13516122267647999,
%T A139197 2872446304320552959999,982417999304411328282623999999,
%U A139197 913648739353102535302840319999999
%N A139197 Natural numbers of the form (prime(n)!-9)/9.
%t A139197 Table[(Prime[n]! - 9)/9, {n, 4, 20}]
%t A139197 (Prime[Range[4,20]]!-9)/9 (* _Harvey P. Dale_, Apr 10 2019 *)
%Y A139197 Cf. A139189, A139190, A139191, A139192, A139193, A139194, A139195, A139196, A139197, A139198.
%K A139197 nonn
%O A139197 1,1
%A A139197 _Artur Jasinski_, Apr 11 2008