A112856 - OEIS

A112856

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

3, 13, 30241, 670442572801, 20007974164906320568399715106816000001, 31370018474571622355156067715319586116075520000001

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OFFSET

1,1

COMMENTS

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

LINKS

MATHEMATICA

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

CROSSREFS

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

KEYWORD

nonn

AUTHOR

STATUS

approved