id:A115709 - OEIS Search Results

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Pentagonal numbers (A000326) whose digit reversal is a semiprime (A001358).

+0
5

12, 22, 51, 176, 330, 532, 590, 715, 782, 925, 1162, 1247, 1335, 1426, 1717, 3151, 3290, 4187, 5551, 7107, 7315, 7957, 10542, 10795, 11051, 11837, 12376, 14950, 15251, 15555, 15862, 16172, 17120, 19097, 19780, 20126, 22265, 24130, 24512 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`532 is the 19th pentagonal number and 235=5*47 is semiprime.`
	CROSSREFS	`Cf. A000326, A001358, A115708.` `Sequence in context: A124885 A115745 A129639 this_sequence A115703 A014633 A066458` `Adjacent sequences: A115706 A115707 A115708 this_sequence A115710 A115711 A115712`
	KEYWORD	`nonn,base`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research