A066644 a(n) = floor(surface area of a sphere with radius n).

12, 50, 113, 201, 314, 452, 615, 804, 1017, 1256, 1520, 1809, 2123, 2463, 2827, 3216, 3631, 4071, 4536, 5026, 5541, 6082, 6647, 7238, 7853, 8494, 9160, 9852, 10568, 11309, 12076, 12867, 13684, 14526, 15393, 16286, 17203, 18145, 19113, 20106, 21124, 22167

Offset

1,1

Links

Harry J. Smith, Table of n, a(n) for n = 1..1000

Formula

a(n) = floor(4*Pi*n^2).

Maple

A066644:=n->floor(4*Pi*n^2): seq(A066644(n), n=1..100); # Wesley Ivan Hurt, Sep 15 2015

Mathematica

Table[ Floor[4Pi*n^2], {n, 50} ]

Prog

(PARI) { for (n=1, 1000, write("b066644.txt", n, " ", floor(4*Pi*n^2)) ) } \\ Harry J. Smith, Mar 16 2010

Crossrefs

Sequence in context: A009932 A009933 A009930 * A009934 A009927 A009938

Adjacent sequences: A066641 A066642 A066643 * A066645 A066646 A066647

Keyword

easy,nonn

Author

Amarnath Murthy, Dec 29 2001

Extensions

More terms from Robert G. Wilson v, Jan 03 2002

Status

approved