id:A094701 - OEIS Search Results

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Least linear combination of phi(n) and sigma(n).

+0
2

1, 2, 2, 2, 2, 1, 2, 2, 3, 3, 2, 3, 2, 4, 5, 2, 2, 3, 2, 4, 7, 4, 2, 2, 5, 4, 3, 1, 2, 5, 2, 2, 9, 4, 18, 3, 2, 4, 9, 4, 2, 7, 2, 6, 3, 4, 2, 3, 7, 5, 9, 5, 2, 3, 7, 3, 9, 4, 2, 5, 2, 4, 7, 2, 11, 7, 2, 9, 9, 10, 2, 3, 2, 4, 12, 4, 10, 7, 2, 5, 3, 4, 2, 3, 13, 4, 9, 4, 2, 5, 9, 9, 9, 4, 19, 3, 2, 7, 5, 5, 2, 7 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) is least sum of coefficients of the 2 functions such that the form is a multiple of n. a(n) is a generalization of multiperfect number.`
	LINKS	`Walter Nissen, Home Page (listed in lieu of email address)`
	FORMULA	`a(multiperfect) = 1. a(prime) = 2 as 1phi(prime) + 1sigma(prime) and 1+1 = 2 . For primes > 5, a(2*prime) = 4.`
	EXAMPLE	`a(6) = 1 as 1sigma(6) is a multiple of 6.` `a(14) = 4 as 3phi(14) + 1sigma(14) = 36 + 24 = 3*14, where 3+1 = 4.`
	CROSSREFS	`Cf. A000010, A000203, A000396, A005820, A027687, A046060, A046061.` `Sequence in context: A063982 A055020 A052435 this_sequence A054715 A145443 A118144` `Adjacent sequences: A094698 A094699 A094700 this_sequence A094702 A094703 A094704`
	KEYWORD	`nonn`
	AUTHOR	`Walter Nissen May 20 2004`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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