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A177926
a(n) = ((n-th-prime - 1)!)^2
4
1, 4, 576, 518400, 13168189440000, 229442532802560000, 437763136697395052544000000, 40990389067797283140009984000000, 1263377636044591724886240423994982400000000, 92956902680071188234494975268405495542386262016000000000000
OFFSET
1,2
COMMENTS
Except first three terms, sqrt(a(n)/400) is an integer, also sqrt(a(n+1/a(n)) is an integer. [From Giovanni Teofilatto, May 16 2010]
MATHEMATICA
((Prime[Range[10]]-1)!)^2 (* Harvey P. Dale, Apr 13 2014 *)
CROSSREFS
Cf. A177771.
Sequence in context: A282196 A114764 A134372 * A241095 A343474 A177963
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, May 15 2010
EXTENSIONS
One more term from Harvey P. Dale, Apr 13 2014
STATUS
approved