id:A058075 - OEIS Search Results

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Numbers n such that GCD(sigma(n), sigma(n+1)) = 1, where sigma(n) is sum of positive divisors of n.

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1, 2, 3, 4, 7, 8, 9, 15, 16, 18, 24, 25, 31, 35, 36, 48, 63, 64, 72, 80, 81, 97, 99, 100, 120, 121, 127, 128, 143, 144, 162, 200, 224, 225, 241, 255, 256, 288, 289, 323, 337, 399, 400, 483, 511, 512, 528, 529, 575, 576, 577, 578, 624, 625, 675, 721, 722, 728, 729 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`8 is included because sigma(8) = 15 is relatively prime to sigma(9) = 13.`
	CROSSREFS	`Sequence in context: A032843 A023774 A152037 this_sequence A029783 A112736 A059930` `Adjacent sequences: A058072 A058073 A058074 this_sequence A058076 A058077 A058078`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Nov 11 2000`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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