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A073444 Primes of the form n! - n - 1. 1

%I #4 Mar 30 2012 17:36:39

%S 2,19,3628789,479001587

%N Primes of the form n! - n - 1.

%C a(2) = 3628789 through a(4), a 730-digit number, have been certified prime with Primo.

%F a(k) = A073443(k)! - A073443(k) - 1.

%e a(1) = 4! - 4 - 1 = 19, a prime, so 19 is in this sequence (4 = A073443(1)).

%o (PARI) for(n=3,2000, p=n!-n-1; if(isprime(p),print1(p,",")))

%Y Cf. A073443 (corresponding n).

%K nonn

%O 1,1

%A _Rick L. Shepherd_, Jul 31 2002

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)