id:A115741 - OEIS Search Results

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Semiprimes (A001358) whose digit reversal is a triangular number.

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6, 10, 51, 55, 82, 87, 309, 501, 649, 694, 1198, 1207, 1473, 1765, 1803, 1837, 1959, 1981, 3043, 3057, 3561, 3574, 5158, 5221, 5721, 6139, 6193, 6267, 6535, 6711, 6814, 6843, 10473, 10497, 11553, 12477, 12693, 13123, 13701, 13951, 14169 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`51=3*17 is semiprime and 15=T(5).`
	CROSSREFS	`Cf. A001358, A115742.` `Sequence in context: A083333 A032359 A115917 this_sequence A136843 A136848 A136849` `Adjacent sequences: A115738 A115739 A115740 this_sequence A115742 A115743 A115744`
	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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