A300947 Primes of form (2*k)! + k! + 1.

3, 727, 20922789928321, 403291461126605641811020801, 523022617466601111760007224221719391608832001

Offset

1,1

Comments

The next term is too large to include.

Links

Table of n, a(n) for n=1..5.

Formula

a(n) = (2*A242487(n))! + A242487(n)! + 1.

Maple

select(isprime, [seq(factorial(2*k)+factorial(k)+1, k=0..600)]); # Muniru A Asiru, May 27 2018

Prog

(PARI) lista(nn) = {for(k=0, nn, if(ispseudoprime(p=(2*k)!+k!+1), print1(p, ", "))); } \\ Altug Alkan, Mar 22 2018

Crossrefs

Cf. A088332, A118812, A242487.

Sequence in context: A231604 A306961 A059120 * A013826 A255012 A133014

Adjacent sequences: A300944 A300945 A300946 * A300948 A300949 A300950

Keyword

nonn

Author

Seiichi Manyama, Mar 22 2018

Status

approved