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 A136350 #8 May 08 2025 09:59:55
%S A136350 210,510510,9699690,223092870,6469693230,200560490130,7420738134810,
%T A136350 13082761331670030,614889782588491410,32589158477190044730,
%U A136350 1922760350154212639070,117288381359406970983270
%N A136350 Primorial numbers #p such that (#p)-1 is composite.
%C A136350 This sequence is different from A121069 and A002110.
%F A136350 {A002110(j): A002110(j)-1 in A002808}. - _R. J. Mathar_, Jul 23 2008
%e A136350 a(1)=210 because 209=A002110(4)-1 is not prime.
%t A136350 Select[FoldList[Times, 1, Prime[Range[18]]],CompositeQ[#-1]&] (* _James C. McMahon_, May 08 2025 *)
%Y A136350 Cf. A136349, A136351, A136352, A002110, A121069.
%K A136350 easy,nonn
%O A136350 1,1
%A A136350 _Enoch Haga_, Dec 25 2007
%E A136350 Edited and extended by _R. J. Mathar_, Jul 23 2008