OFFSET
1,3
COMMENTS
Additive basis of order 3: all nonnegative integers can be written as a sum of three elements from this sequence. It appears that other than 7, 12, and 25, all numbers can be written as the sum of two members of this sequence. - Charles R Greathouse IV, Apr 23 2012
LINKS
Charles R. Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
a(n)=floor(n*log(n)). - Enrique Pérez Herrero, Jul 29 2009
MATHEMATICA
Table[Floor[n*Log[n]], {n, 90}] (* Harvey P. Dale, May 29 2024 *)
PROG
(PARI) a(n)=n*log(n)\1 \\ Charles R Greathouse IV, Apr 23 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Dec 27 1999
STATUS
approved