id:A115742 - OEIS Search Results

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Triangular numbers whose digit reversal is a semiprime (A001358).

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6, 15, 28, 55, 78, 105, 120, 190, 496, 780, 903, 946, 1176, 1225, 1275, 1540, 1653, 1770, 1830, 1891, 2080, 3081, 3403, 3486, 3570, 3741, 3916, 4186, 4753, 5050, 5356, 5671, 6670, 7021, 7140, 7381, 7503, 7626, 8515, 8911, 9316, 9591, 9870 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`15=T(5) and 51=3*17 is semiprime.`
	CROSSREFS	`Cf. A001358, A115741.` `Sequence in context: A000384 A164000 A134978 this_sequence A026102 A144519 A066995` `Adjacent sequences: A115739 A115740 A115741 this_sequence A115743 A115744 A115745`
	KEYWORD	`nonn,base`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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