id:A115906 - OEIS Search Results

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

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1, 2, 5, 7, 9, 16, 144, 186, 410, 656, 680, 805, 963, 968, 1152, 1331, 1419, 1476, 1557, 1608, 2158, 2220, 2376, 2401, 2529, 2840, 3376, 3447, 3570, 3591, 4018, 5030, 5769, 5967, 6530, 6720, 6854, 6955, 7250, 7856, 8004, 8514, 8946, 9144 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`1331+sigma(1331)+phi(1331)=4005=T(89).`
	CROSSREFS	`Cf. A069066, A115904, A115905.` `Sequence in context: A115863 A093417 A083272 this_sequence A086422 A046880 A142879` `Adjacent sequences: A115903 A115904 A115905 this_sequence A115907 A115908 A115909`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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