id:A116035 - OEIS Search Results

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Numbers n such that n+phi(n)+sigma(n) is a prime.

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1, 4, 15, 33, 35, 36, 50, 55, 57, 64, 65, 75, 77, 85, 87, 93, 98, 115, 119, 129, 133, 143, 155, 159, 185, 187, 189, 205, 213, 215, 217, 219, 242, 243, 247, 253, 265, 287, 295, 303, 309, 323, 324, 327, 339, 345, 365, 385, 393, 395, 407, 425, 427, 453, 469, 493 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`205+phi(205)+sigma(205) = 617 (prime).`
	CROSSREFS	`Cf. A078762, A068080.` `Adjacent sequences: A116032 A116033 A116034 this_sequence A116036 A116037 A116038` `Sequence in context: A031012 A121914 A110341 this_sequence A022265 A120389 A124150`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.

AT&T Labs Research