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A079529 sigma(n) - ceiling(n + sqrt n) as n runs through the composite numbers A002808. 1
1, 3, 4, 1, 4, 12, 6, 5, 11, 16, 17, 6, 9, 31, 1, 10, 7, 22, 36, 25, 9, 14, 7, 49, 15, 10, 43, 47, 33, 26, 19, 69, 1, 35, 13, 38, 58, 9, 56, 15, 24, 100, 26, 33, 55, 10, 69, 49, 18, 65, 114, 31, 40, 55, 10, 81, 97, 31, 34, 130, 13, 36, 23, 82, 134, 11, 66, 25, 40, 15, 146, 63, 47, 107 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It is known that a(n) >= 0.

REFERENCES

D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, Section III.1.1.a.

W. Sierpiński, Elementary Theory of Numbers. Państ. Wydaw. Nauk., Warsaw, 1964.

LINKS

Table of n, a(n) for n=1..74.

W. Sierpiński, Elementary Theory of Numbers, Warszawa 1964.

PROG

(PARI) lista(nn) = forcomposite(n=1, nn, print1(sigma(n) - ceil(n + sqrt(n)), ", ")); \\ Michel Marcus, Dec 12 2014

CROSSREFS

Cf. A079528, A055682, A058208.

Sequence in context: A299446 A300084 A321624 * A299022 A298532 A133779

Adjacent sequences:  A079526 A079527 A079528 * A079530 A079531 A079532

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 22 2003

STATUS

approved

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Last modified May 7 09:22 EDT 2021. Contains 343645 sequences. (Running on oeis4.)