A177926 a(n) = ((prime(n) - 1)!)^2.

1, 4, 576, 518400, 13168189440000, 229442532802560000, 437763136697395052544000000, 40990389067797283140009984000000, 1263377636044591724886240423994982400000000, 92956902680071188234494975268405495542386262016000000000000

Offset: 1

Author

Giovanni Teofilatto, May 15 2010

Keywords

• easy
• nonn

Comments

Except first three terms, sqrt(a(n)/400) is an integer, also sqrt(a(n+1)/a(n)) is an integer. - Giovanni Teofilatto, May 16 2010

Crossrefs

Cf. A177771.

Programs

Mathematica

((Prime[Range[10]]-1)!)^2 (* Harvey P. Dale, Apr 13 2014 *)

Extensions

One more term from Harvey P. Dale, Apr 13 2014