id:A115657 - OEIS Search Results

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Both n and the reverse of n are pentagonal numbers (A000326).

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1, 5, 22, 210, 287, 782, 1001, 2882, 7740, 15251, 77180, 565187, 720027, 781565, 7081807, 7451547, 26811862, 54177145, 206489067, 246214610, 760984602, 1050660501, 1085885801, 1528888251, 2642326276, 2911771192, 6726232462 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`565187=P(614) and 781565=P(722), where P(k)=k(3k-1)/2 is the k-th pentagonal number.`
	CROSSREFS	`Cf. A000326, A061455, A061457.` `Sequence in context: A129437 A048252 A066866 this_sequence A066865 A005632 A002069` `Adjacent sequences: A115654 A115655 A115656 this_sequence A115658 A115659 A115660`
	KEYWORD	`base,nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 28 2006`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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