id:A079528 - OEIS Search Results

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sigma(n) - ceiling( n + sqrt n ).

+0
2

-1, -1, -1, 1, -2, 3, -2, 4, 1, 4, -3, 12, -3, 6, 5, 11, -4, 16, -4, 17, 6, 9, -4, 31, 1, 10, 7, 22, -5, 36, -5, 25, 9, 14, 7, 49, -6, 15, 10, 43, -6, 47, -6, 33, 26, 19, -6, 69, 1, 35, 13, 38, -7, 58, 9, 56, 15, 24, -7, 100, -7, 26, 33, 55, 10, 69, -8, 49, 18, 65, -8, 114, -8, 31, 40, 55, 10, 81, -8, 97 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`a(n) >= 0 if n composite.`
	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. A079529, A055682, A058208.` `Adjacent sequences: A079525 A079526 A079527 this_sequence A079529 A079530 A079531` `Sequence in context: A131580 A087038 A060847 this_sequence A143422 A071438 A030011`
	KEYWORD	`sign`
	AUTHOR	`njas, Jan 22 2003`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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