id:A050934 - OEIS Search Results

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Numbers n such that phi(n)*d(n) is a multiple of sigma(n), where d(n) is the number of divisors of n.

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1, 3, 14, 35, 42, 105, 209, 248, 297, 418, 594, 627, 744, 1045, 1254, 1485, 1736, 2926, 3135, 3339, 3596, 3689, 3956, 4064, 4158, 5208, 5396, 5890, 6461, 7315, 7668, 8370, 8636, 8680, 8778, 8932, 9875, 10013, 10395, 10788, 11067, 11687 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Equality holds for 1, 3, 14, 42 and no others < 4290000000.`
	EXAMPLE	`phi(35)d(35)=424, a multiple of sigma(35)=48, so 35 is in the sequence.`
	CROSSREFS	`Cf. A000005, A000010, A000203.` `Sequence in context: A076533 A081379 A081377 this_sequence A110427 A128916 A130287` `Adjacent sequences: A050931 A050932 A050933 this_sequence A050935 A050936 A050937`
	KEYWORD	`nonn`
	AUTHOR	`Jud McCranie (j.mccranie(AT)comcast.net), Dec 30 1999`

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

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