id:A115905 - OEIS Search Results

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

+0
5

2, 4, 9, 11, 20, 23, 25, 27, 49, 53, 92, 93, 105, 121, 127, 147, 150, 163, 169, 220, 228, 231, 233, 281, 286, 289, 294, 332, 361, 431, 474, 529, 541, 543, 548, 613, 660, 675, 710, 726, 743, 825, 827, 841, 888, 891, 961, 977, 993, 1014, 1028, 1265, 1310, 1369 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`121+phi(121)=231=T(21).`
	CROSSREFS	`Cf. A069066, A115908, A115910.` `Sequence in context: A101255 A047348 A093859 this_sequence A096134 A058885 A022428` `Adjacent sequences: A115902 A115903 A115904 this_sequence A115906 A115907 A115908`
	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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