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A079529 sigma(n) - ceiling( n + sqrt n ) as n runs through the composite numbers A002808. +0
2
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; listen)
OFFSET

1,2

COMMENT

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

REFERENCES

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

W. Sierpi\'{n}ski, Elementary Theory of Numbers. Pa\'{n}st. Wydaw. Nauk., Warsaw, 1964.

LINKS

W. Sierpi\'{n}ski, Elementary Theory of Numbers, Warszawa 1964.

CROSSREFS

Cf. A079528, A055682, A058208.

Sequence in context: A105579 A124446 A091542 this_sequence A133779 A137911 A019599

Adjacent sequences: A079526 A079527 A079528 this_sequence A079530 A079531 A079532

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Jan 22 2003

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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.


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