A112856 Primes of the form (2*n)!/n!+1.

3, 13, 30241, 670442572801, 20007974164906320568399715106816000001, 31370018474571622355156067715319586116075520000001

Offset: 1

Author

Hugo Pfoertner, Sep 25 2005

Keywords

• nonn

Comments

Next term (2*72)!/72!+1 has 146 decimal digits.

Crossrefs

Cf. A112855 n such that (2*n)!/n!+1 is prime, A112854 primes of the form (2*n)!/n!-1.

Programs

Mathematica

Select[Table[(2n)!/n!+1,{n,50}],PrimeQ] (* Harvey P. Dale, Aug 02 2022 *)