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 A108270 #15 Aug 31 2025 01:21:18 %S A108270 1,4,6,8,30,40,164,176,189,218,370,597,603,1473,2176,2436,2548,2732, %T A108270 4758,5574 %N A108270 Numbers k such that k*k! + (smallest prime >= k) is prime. %C A108270 Note that Maple, PARI etc. have different notions of what "next prime" means! %F A108270 A096986 INTERSECT A018252. - _R. J. Mathar_, Aug 13 2007 %t A108270 Select[Range[5600],PrimeQ[# (#!) +NextPrime[#-1]]&] (* _Harvey P. Dale_, Oct 07 2019 *) %o A108270 (PARI) for(x=1,1000,if(isprime(x*x!+nextprime(x)),print1(x,","))) %Y A108270 Cf. A096986. %K A108270 nonn,more,changed %O A108270 1,2 %A A108270 _Jorge Coveiro_, Jul 24 2006 %E A108270 a(11)-a(20) from _Donovan Johnson_, Dec 13 2008