A057224 - OEIS

%I #15 Jan 14 2024 14:01:29

%S 1,2,3,4,5,6,13,17

%N Numbers n such that (Product of first n Mersenne prime exponents) + 1 is prime.

%o (PARI) lista(v) = {for (n=1, #v, if (isprime(prod(k=1, n, v[k]) + 1), print1(n, ", ")););} \\ with v=A000043; _Michel Marcus_, Jan 07 2014

%Y Cf. A000043, A057225.

%K nonn

%O 1,2

%A _G. L. Honaker, Jr._, Sep 18 2000