A112862 Primes of the form (2*k)!/(2*(k!)^2)-1.

2, 461, 92377, 269128937219, 51913710643776705684835559, 3017467217880703353213932318284163999

Offset

1,1

Comments

The next term (2*306)!/(2*(306!)^2)-1 has 183 decimal digits.

Links

Table of n, a(n) for n=1..6.

Mathematica

Select[Table[(2n)!/(2(n!)^2)-1, {n, 70}], PrimeQ] (* James C. McMahon, Jun 13 2024 *)

Crossrefs

Cf. A001700, A112861, A112864.

Sequence in context: A363699 A099686 A066152 * A094484 A062620 A108973

Adjacent sequences: A112859 A112860 A112861 * A112863 A112864 A112865

Keyword

nonn

Author

Hugo Pfoertner, Sep 30 2005

Status

approved