id:A065512 - OEIS Search Results

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Numbers n such that sigma(n) + 1 is prime.

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1, 3, 5, 6, 10, 11, 12, 17, 20, 22, 24, 26, 27, 29, 30, 38, 41, 42, 45, 46, 51, 55, 59, 62, 68, 69, 71, 77, 82, 85, 88, 91, 99, 101, 104, 105, 106, 107, 108, 114, 116, 118, 125, 126, 132, 135, 136, 137, 140, 141, 145, 146, 147, 149, 150, 155, 158, 160, 161 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`sigma(10) + 1 = 18 + 1 = 19 (prime). sigma(24) + 1 = 60 + 1 = 61 (prime).`
	MATHEMATICA	`Select[ Range[170], PrimeQ[ DivisorSigma[1, # ] + 1] & ]`
	CROSSREFS	`Cf. A000203.` `Adjacent sequences: A065509 A065510 A065511 this_sequence A065513 A065514 A065515` `Sequence in context: A102606 A102372 A095829 this_sequence A066147 A140951 A065873`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Nov 26 2001`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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