A135971 Ceiling(4*Pi*n^2).

13, 51, 114, 202, 315, 453, 616, 805, 1018, 1257, 1521, 1810, 2124, 2464, 2828, 3217, 3632, 4072, 4537, 5027, 5542, 6083, 6648, 7239, 7854, 8495, 9161, 9853, 10569, 11310, 12077, 12868, 13685, 14527, 15394, 16287, 17204, 18146, 19114, 20107

Offset: 1

Author

Mohammad K. Azarian, Mar 02 2008

Keywords

• nonn
• easy

Comments

The original definition was "a(n)=ceiling[surface area of a shpere of radius n]".

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A066643, A066644, A066645, A135039.

Programs

Mathematica

Table[Ceiling[4 Pi n^2], {n, 1, 50}] (* Vincenzo Librandi, Feb 19 2013 *)

Extensions

Definition replaced by Bruno Berselli, Feb 19 2013