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 A136355 #15 Aug 13 2025 10:19:12
%S A136355 1155,255255,4849845,111546435,152125131763605,6541380665835015,
%T A136355 16294579238595022365,58644190679703485491635,
%U A136355 3929160775540133527939545,278970415063349480483707695,20364840299624512075310661735,1608822383670336453949542277065
%N A136355 Numbers of the form P = product of the first k odd primes where P+2 is composite.
%C A136355 This sequence is different from A070826 and A118750.
%H A136355 Harvey P. Dale, <a href="/A136355/b136355.txt">Table of n, a(n) for n = 1..332</a>
%e A136355 a(1)=1155 because 1157 is not prime.
%t A136355 v=Select[Range[21],!PrimeQ[Product[Prime[k+1],{k,#}]+2]&]; Table[Product[Prime[k+1],{k,v[[t]]}],{t,Length[v]}] (* _Farideh Firoozbakht_, Aug 12 2009 *)
%t A136355 Select[FoldList[Times,Prime[Range[2,22]]],CompositeQ[#+2]&] (* _Harvey P. Dale_, Jun 08 2022 *)
%Y A136355 Cf. A136349-A136354, A136356-A136358, A070826, A118750.
%K A136355 easy,nonn
%O A136355 1,1
%A A136355 _Enoch Haga_, Dec 25 2007
%E A136355 Edited with more terms by _Farideh Firoozbakht_, Aug 12 2009