A080668 Numbers of the form n!+n^3.

2, 10, 33, 88, 245, 936, 5383, 40832, 363609, 3629800, 39918131, 479003328, 6227022997, 87178293944, 1307674371375, 20922789892096, 355687428100913, 6402373705733832, 121645100408838859, 2432902008176648000

Offset

1,1

Comments

Sum of the reciprocals = 0.6470299890164780452999873886..

Links

Table of n, a(n) for n=1..20.

Mathematica

Table[n!+n^3, {n, 20}] (* Harvey P. Dale, May 21 2015 *)

Prog

(PARI) factncub(n) = {sr=0; for(x=1, n, y=x!+x^3; print1(y", "); sr+=1.0/y; ); print(); print(sr) }

Crossrefs

Sequence in context: A263839 A236921 A316644 * A062453 A036369 A294667

Adjacent sequences: A080665 A080666 A080667 * A080669 A080670 A080671

Keyword

easy,nonn

Author

Cino Hilliard, Mar 02 2003

Status

approved