id:A115904 - OEIS Search Results

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

+0
3

7, 10, 66, 136, 145, 196, 198, 234, 270, 438, 495, 528, 592, 606, 855, 910, 1045, 1158, 1428, 2208, 2718, 2922, 3016, 3663, 3808, 3916, 4506, 4975, 5043, 5136, 5598, 6366, 6600, 7080, 7498, 7821, 8172, 8200, 8217, 8814, 9318, 9730, 9738 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`234+sigma(234)=780=T(39).`
	CROSSREFS	`Cf. A069066, A115907, A115909.` `Sequence in context: A025632 A038276 A097187 this_sequence A136865 A123797 A123805` `Adjacent sequences: A115901 A115902 A115903 this_sequence A115905 A115906 A115907`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research