id:A068882 - OEIS Search Results

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Triangular numbers with property that digits alternate in parity.

+0
4

1, 3, 6, 10, 21, 36, 45, 78, 105, 210, 276, 325, 496, 561, 630, 703, 741, 903, 1830, 2145, 2701, 5050, 6105, 6903, 8385, 9870, 10585, 12561, 14365, 18145, 18721, 23436, 25878, 29890, 30381, 32385, 36585, 38503, 38781, 41616, 47278, 50721 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`1830 is a term as 1, 8, 3 and 0 have odd and even parity alternately.`
	CROSSREFS	`Cf. A068876, A030152.` `Sequence in context: A060179 A056411 A068855 this_sequence A076713 A136569 A061883` `Adjacent sequences: A068879 A068880 A068881 this_sequence A068883 A068884 A068885`
	KEYWORD	`nonn,base`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 19 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 23 2002`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

AT&T Labs Research