A062359 a(n) = floor(n!/sigma(n)).

1, 0, 1, 3, 20, 60, 630, 2688, 27913, 201600, 3326400, 17107200, 444787200, 3632428800, 54486432000, 674928706064, 19760412672000, 164163428352000, 6082255020441600, 57926238289920000, 1596591942865920000, 31222242438266880000, 1077167364120207360000, 10340806695553990656000

Offset

1,4

Links

Harry J. Smith, Table of n, a(n) for n = 1..100

Example

a(7) = 630 because floor(7!/sigma(7)) = floor(5040/8) = floor(630) = 630.

Maple

with(numtheory): seq(floor(factorial(n)/sigma(n)), n=1..25); # Muniru A Asiru, Jun 29 2018

Mathematica

Table[Floor[n!/DivisorSigma[1, n]], {n, 25}]  (* Harvey P. Dale, Mar 23 2011 *)

Prog

(PARI) a(n)=n!\sigma(n);
(Magma) [Floor(Factorial(n)/DivisorSigma(1, n)): n in [1..25]]; // Vincenzo Librandi, Jun 29 2018
(GAP) List([1..25], n->Int(Factorial(n)/Sigma(n))); # Muniru A Asiru, Jun 29 2018

Crossrefs

Sequence in context: A281268 A143582 A132404 * A342672 A099721 A024402

Adjacent sequences: A062356 A062357 A062358 * A062360 A062361 A062362

Keyword

easy,nonn

Author

Jason Earls, Jul 06 2001

Status

approved