login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A135039 a(n)=ceiling[area of a circle of radius n]. 2
4, 13, 29, 51, 79, 114, 154, 202, 255, 315, 381, 453, 531, 616, 707, 805, 908, 1018, 1135, 1257, 1386, 1521, 1662, 1810, 1964, 2124, 2291, 2464, 2643, 2828, 3020, 3217, 3422, 3632, 3849, 4072, 4301, 4537, 4779, 5027, 5282, 5542, 5809, 6083, 6362, 6648 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=ceiling[pi*n^2]

MATHEMATICA

Ceiling[Pi Range[50]^2] (* From Harvey P. Dale, Oct 10 2011 *)

CROSSREFS

Cf. A066643.

Sequence in context: A155331 A155387 A155366 * A168559 A015634 A161742

Adjacent sequences:  A135036 A135037 A135038 * A135040 A135041 A135042

KEYWORD

nonn

AUTHOR

Mohammad K. Azarian (azarian(AT)evansville.edu), Feb 29 2008

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 23:16 EST 2012. Contains 205687 sequences.