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 A088257 #20 Mar 17 2020 21:19:14 %S A088257 1,2,6,30,210,2310,30030,200560490130,304250263527210, %T A088257 23768741896345550770650537601358310 %N A088257 Primorials P which have at least one prime neighbor; i.e., P+1 or P-1 or both are primes. %C A088257 A supersequence of A088256. %C A088257 Next term a(11) is 131 digits and is too large to include. %H A088257 Alois P. Heinz, <a href="/A088257/b088257.txt">Table of n, a(n) for n = 1..19</a> %t A088257 Select[FoldList[Times,1,Prime[Range[70]]],PrimeQ[#-1]||PrimeQ[#+1]&] (* _Harvey P. Dale_, Oct 22 2011 *) %Y A088257 Cf. A002110, A088256. %K A088257 nonn %O A088257 1,2 %A A088257 _Amarnath Murthy_, Sep 27 2003 %E A088257 More terms from _Ray Chandler_, Sep 28 2003