id:A115708 - OEIS Search Results

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Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326).

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10, 15, 21, 22, 235, 287, 517, 529, 671, 1513, 1555, 2611, 5137, 5331, 6241, 7017, 7171, 7421, 7597, 7814, 10078, 10913, 15011, 15094, 15214, 15251, 20395, 20603, 21542, 23129, 24501, 24873, 25157, 26851, 27161, 51998, 53297, 54989, 55551 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`235=5*47 is semiprime and 532 is the 19th pentagonal number.`
	CROSSREFS	`Cf. A000326, A001358, A115709.` `Sequence in context: A045161 A105156 A108614 this_sequence A068992 A098564 A062691` `Adjacent sequences: A115705 A115706 A115707 this_sequence A115709 A115710 A115711`
	KEYWORD	`nonn,base`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006`

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

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