Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A025224
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A025224 Floor( Sum_{k=1..n} {sqrt(k)} ). +0
1
0, 1, 2, 4, 6, 8, 10, 13, 16, 19, 22, 25, 29, 32, 36, 40, 44, 48, 52, 57, 61, 66, 70, 75, 80, 85, 90, 95, 101, 106, 112, 117, 123, 129, 134, 140, 146, 152, 159, 165, 171, 178, 184, 191, 197, 204, 211, 218, 224, 231, 239, 246, 253, 260, 268, 275, 282, 290, 298, 305, 313, 321, 329, 337 (list; graph; listen)
OFFSET

0,3

LINKS

Charles R Greathouse IV, Home Page [in lieu of email address]

S. Ramanujan, "On the sum of the square roots of the first n natural numbers". Journal of the Indian Mathematical Society, VIII (1915), pp. 173-175.

FORMULA

a(n) ~= floor (2/3 * (n + 1/2) - exp(-Pi / 2)) - Charles R Greathouse IV Jul 29 2007

CROSSREFS

Sequence in context: A130174 A061168 A130798 this_sequence A096182 A056827 A024172

Adjacent sequences: A025221 A025222 A025223 this_sequence A025225 A025226 A025227

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.


AT&T Labs Research