|
| |
|
|
A072107
|
|
a(n) = sum( k=1,n, A014963(k) ).
|
|
2
| |
|
|
1, 3, 6, 8, 13, 14, 21, 23, 26, 27, 38, 39, 52, 53, 54, 56, 73, 74, 93, 94, 95, 96, 119, 120, 125, 126, 129, 130, 159, 160, 191, 193, 194, 195, 196, 197, 234, 235, 236, 237, 278, 279, 322, 323, 324, 325, 372, 373, 380, 381, 382, 383, 436, 437, 438, 439, 440, 441
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| Is there an expression for lim n -> infinity a(n)/n^2?
Equals row sums of triangle A140582. - Gary W. Adamson (qntmpkt(AT)yahoo.com), May 17 2008
|
|
|
PROG
| (PARI) for(n=2, 100, print1(1+sum(k=2, n, if(if(omega(k)-1, 0, 1)*component(component(factor(k), 1), 1), if(omega(k)-1, 0, 1)*component(component(factor(k), 1), 1), 1)), ", "))
|
|
|
CROSSREFS
| Cf. A140582.
Sequence in context: A182727 A006048 A049827 * A084578 A190493 A070881
Adjacent sequences: A072104 A072105 A072106 * A072108 A072109 A072110
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 19 2002
|
| |
|
|
