A118222 - OEIS

A118222

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

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

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OFFSET

1,3

COMMENTS

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

LINKS

EXAMPLE

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

CROSSREFS

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(9) from Michael S. Branicky, Dec 13 2023

a(1)=0 inserted and a(10) from Michael S. Branicky, Sep 09 2024

STATUS

approved