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 A176038 #7 Jul 11 2025 18:40:01
%S A176038 2,3,11,13,2879,86399,114000816848279961600001,
%T A176038 2284848632399058501374484565150666260597460935294482959564800000000000001
%N A176038 Primes of the form k!*(k+1)! - 1 or k!*(k+1)! + 1.
%C A176038 Primes of the form A010790(k)-1 or A010790(k)+1. This is the 2nd sequence in the supersequence whose first member is factorial primes, A002981 UNION A002982. No more through 20!*(20+1)! + 1.
%C A176038 a(9) has already 225 digits. The terms are generated by n= 0,1,2,2,4,5,14,32,76,166... [From _R. J. Mathar_, Aug 31 2010]
%F A176038 [{A010790(n)-1} INTERSECTION A000040] UNION [{A010790(n)+1} INTERSECTION A000040].
%e A176038 a(6) = 86399 because 5!*(5+1)! - 1 = 86399 is prime. a(7) = 114000816848279961600001 because 14!*(14+1)! + 1 = 114000816848279961600001 is prime.
%Y A176038 Cf. A000040, A000142, A002981, A002982, A010790.
%K A176038 more,nonn
%O A176038 1,1
%A A176038 _Jonathan Vos Post_, Apr 07 2010
%E A176038 One more term from _R. J. Mathar_, Aug 31 2010