id:A066147 - OEIS Search Results

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Numbers n such that all 3 of EulerPhi(n) + 1, d(n) + 1, sigma(n) + 1 are simultaneously prime (d(n) denotes the number of divisors of n).

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1, 3, 5, 6, 10, 11, 12, 17, 22, 26, 27, 29, 38, 41, 46, 55, 59, 62, 71, 77, 82, 91, 99 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`EulerPhi(12) + 1 = 5, d(12) + 1 = 7, sigma(12) + 1 = 29, all prime.`
	CROSSREFS	`Sequence in context: A102372 A095829 A065512 this_sequence A065873 A072282 A047327` `Adjacent sequences: A066144 A066145 A066146 this_sequence A066148 A066149 A066150`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Dec 12 2001`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.