id:A162281 - OEIS Search Results

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Values of sigma_0(n) for n in A162279.

+0
3

4, 4, 4, 4, 4, 8, 4, 8, 4, 4, 4, 4, 8, 4, 8, 4, 4, 8, 4, 4, 8, 12, 4, 8, 4, 8, 4, 4, 4, 8, 6, 4, 4, 8, 4, 8, 12, 4, 4, 4, 8, 4, 4, 4, 4, 8, 4, 8, 12, 4, 4, 8, 16, 4, 8, 12, 4, 8, 4, 6, 4, 4, 12, 4, 8, 4, 4, 8, 4, 12, 4, 8, 4, 8, 12, 4, 4, 8, 6, 4, 8, 16, 12, 4, 4, 4, 4, 8, 4, 12, 4, 8, 4, 4, 8, 4, 8, 12, 4, 8 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`No primes can appear in this sequence; to have sigma_0(n) = p, a prime, we must have n = q^{p-1} for some prime q, and each such n for fixed p will have a distinct value for sigma(n).` `Conjecture: every composite number appears in this sequence. - Max Alekseyev (maxale(AT)gmail.com)` `Up to sigma(n) = 500000, the only odd value is 9, for 106276 = 326^2 and 165649 = 407^2; these have sigma(n) = 187131.`
	LINKS	`Franklin T. Adams-Watters, Table of duplicate sigma values up to sigma(n) = 10000`
	FORMULA	`a(n) = A000005(A162279(n)) = A000005(A162280(n)).`
	CROSSREFS	`Cf. A000005, A162279.` `Sequence in context: A085142 A064053 A108893 this_sequence A048760 A035627 A165923` `Adjacent sequences: A162278 A162279 A162280 this_sequence A162282 A162283 A162284`
	KEYWORD	`nonn`
	AUTHOR	`Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 29 2009`

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

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