Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A062550
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A062550 Sum([2n/k]). +0
2
0, 3, 8, 14, 20, 27, 35, 41, 50, 58, 66, 74, 84, 91, 101, 111, 119, 127, 140, 146, 158, 168, 176, 186, 198, 207, 217, 227, 239, 247, 261, 265, 276, 286, 292, 302, 314, 318, 328, 338, 348, 355, 367, 373, 383, 395, 403, 409, 423, 429, 442, 450, 458, 468, 480 (list; graph; listen)
OFFSET

0,2

COMMENT

The sequence A006218 : Sum_{i=1..n} floor(n/i) = Sum_{i=1..n} sigma_0(i). Sigma_0(i) is A000005. Sequences of the type : Sum_{i=1..f(n)} floor(f(n)/i)= Sum_{i=1..f(n)} sigma_0(i). This sequence A062550(n)= A006218(2*n). [From Ctibor O. Zizka (c.zizka(AT)email.cz), Mar 21 2009]

FORMULA

a(n) =A006218(2n) =A056549(n)+A006218(n) =a(n-1)+A000005(2n-1)+A000005(2n)

CROSSREFS

Cf. A013942.

Cf. A156745,A085831,A153816,A153817,A153876 [From Ctibor O. Zizka (c.zizka(AT)email.cz), Mar 21 2009]

Sequence in context: A140492 A028252 A063617 this_sequence A022947 A098762 A014848

Adjacent sequences: A062547 A062548 A062549 this_sequence A062551 A062552 A062553

KEYWORD

nonn

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), Jun 26 2001

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 December 10 12:37 EST 2009. Contains 170569 sequences.


AT&T Labs Research