A242766 a(n) = floor(sqrt(n!+1)).

1, 1, 1, 2, 5, 11, 26, 71, 200, 602, 1904, 6317, 21886, 78911, 295259, 1143535, 4574143, 18859677, 80014834, 348776576, 1559776268, 7147792818, 33526120082, 160785623545, 787685471322, 3938427356614, 20082117944245, 104349745809073, 552166953567228

Offset

0,4

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..199

Wikipedia, Brocard's problem

Mathematica

Table[Floor[Sqrt[n! + 1]], {n, 0, 30}]

Prog

(Magma) [Floor(Sqrt(Factorial(n)+1)): n in [0..30]];
(PARI) a(n)={sqrtint(n!+1)} \\ Andrew Howroyd, Jan 17 2018

Crossrefs

Cf. A163524.

Sequence in context: A343872 A000664 A364597 * A182580 A067922 A212567

Adjacent sequences: A242763 A242764 A242765 * A242767 A242768 A242769

Keyword

nonn

Author

Vincenzo Librandi, May 29 2014

Status

approved