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 A136352 #17 May 08 2025 22:59:39 %S A136352 510510,9699690,223092870,6469693230,7420738134810,13082761331670030, %T A136352 614889782588491410,32589158477190044730,1922760350154212639070, %U A136352 117288381359406970983270,7858321551080267055879090 %N A136352 Primorials P for which neither P-1 nor P+1 is prime. %C A136352 This sequence is different from A121069 and A002110. %C A136352 For almost all primes p, p# is in this sequence by Brun's theorem. - _Charles R Greathouse IV_, Sep 14 2015 %H A136352 Charles R Greathouse IV, <a href="/A136352/b136352.txt">Table of n, a(n) for n = 1..350</a> %F A136352 Compute P = product of the first k primes. If P is neither preceded nor followed by a prime add P to the sequence. %e A136352 13# = 30030 is preceded by a prime but is not followed by a prime. 17# = 510510 is neither preceded nor followed by a prime. %t A136352 Select[FoldList[Times, 1, Prime[Range[19]]],!PrimeQ[#+1]&&!PrimeQ[#-1]&] (* _James C. McMahon_, May 08 2025 *) %Y A136352 Cf. A136349, A136350, A136351, A002110, A121069. %K A136352 easy,nonn %O A136352 1,1 %A A136352 _Enoch Haga_, Dec 25 2007 %E A136352 Edited by and more terms from _Charles R Greathouse IV_, Sep 29 2008