id:A047779 - OEIS Search Results

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Abundant or perfect numbers n such that neither n-1 nor n+1 is a prime.

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56, 120, 144, 160, 176, 186, 204, 208, 216, 220, 246, 260, 288, 300, 304, 320, 324, 340, 342, 364 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Source`
	EXAMPLE	`a(1) = 56 because 55 and 57 are composite and the sum of the divisors of 56 is 64 which is >= 56 and no integer < 56 has this property.`
	CROSSREFS	`A023196 is a superset.` `Sequence in context: A063347 A054891 A118161 this_sequence A044243 A044624 A157330` `Adjacent sequences: A047776 A047777 A047778 this_sequence A047780 A047781 A047782`
	KEYWORD	`easy,nonn`
	AUTHOR	`Tony Davie (ad(AT)dcs.st-and.ac.uk)`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.