login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Numbers k such that k! * prime(k)# + 1 is prime.
1

%I #10 Sep 09 2024 20:08:35

%S 0,1,2,3,48,151,312,445,4343,6765

%N Numbers k such that k! * prime(k)# + 1 is prime.

%C a(2)-a(8) found and primes proved by PrimeForm ([N-1, Brillhart-Lehmer-Selfridge]).

%e 3 is a term as 3! * prime(3)# + 1 = 3*2*1 * 5*3*2 + 1 = 181, a prime.

%Y Cf. A002110, A118223.

%K nonn,more

%O 1,3

%A _Rick L. Shepherd_, Apr 15 2006

%E a(9) from _Michael S. Branicky_, Dec 13 2023

%E a(1)=0 inserted and a(10) from _Michael S. Branicky_, Sep 09 2024