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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; text; 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, May 17 2008

LINKS

Table of n, a(n) for n=1..58.

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: A006048 A049827 A186736 * A084578 A190493 A070881

Adjacent sequences:  A072104 A072105 A072106 * A072108 A072109 A072110

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Jun 19 2002

STATUS

approved

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Last modified January 18 13:30 EST 2020. Contains 331007 sequences. (Running on oeis4.)