id:A145398 - OEIS Search Results

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a(n) = Sum_{d|n} sigma(d) - Sum_{2c|n} sigma(c) + 4*Sum_{4b|n} sigma(b).

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1, 3, 5, 11, 7, 15, 9, 31, 18, 21, 13, 55, 15, 27, 35, 75, 19, 54, 21, 77, 45, 39, 25, 155, 38, 45, 58, 99, 31, 105, 33, 167, 65, 57, 63, 198, 39, 63, 75, 217, 43, 135, 45, 143, 126, 75, 49, 375, 66, 114, 95, 165, 55, 174, 91, 279, 105, 93, 61, 385, 63, 99, 162, 355, 105, 195 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Probably there is a typo in the formula in Table 1, and this was intended to be A145378.`
	REFERENCES	`J. S. Rutherford, The enumeration and symmetry-significant properties of derivative lattices, Acta Cryst. A48 (1992), 500-508. Table 1, line 3.`
	CROSSREFS	`Sequence in context: A132162 A154561 A073653 this_sequence A087322 A094747 A129738` `Adjacent sequences: A145395 A145396 A145397 this_sequence A145399 A145400 A145401`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Mar 13 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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