A050504 Integer part of n*log(n).

0, 1, 3, 5, 8, 10, 13, 16, 19, 23, 26, 29, 33, 36, 40, 44, 48, 52, 55, 59, 63, 68, 72, 76, 80, 84, 88, 93, 97, 102, 106, 110, 115, 119, 124, 129, 133, 138, 142, 147, 152, 156, 161, 166, 171, 176, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225

Offset: 1

Author

N. J. A. Sloane, Dec 27 1999

Keywords

• nonn
• easy

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
• Index entries for sequences that are an additive basis, order 3.

Crossrefs

See A050503 for more information.

Programs

Mathematica

Table[Floor[n*Log[n]],{n,90}] (* Harvey P. Dale, May 29 2024 *)

PARI

a(n)=n*log(n)\1 \\ Charles R Greathouse IV, Apr 23 2012

Formula

a(n) = floor(n*log(n)). - Enrique Pérez Herrero, Jul 29 2009