id:A062691 - OEIS Search Results

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Triangular numbers that contain exactly 2 different digits.

+0
1

10, 15, 21, 28, 36, 45, 78, 91, 171, 300, 595, 990, 1711, 2211, 3003, 5050, 5151, 5565, 5995, 6555, 8778, 10011, 66066, 222111, 255255, 333336, 500500, 600060, 828828, 887778, 1188111, 5656566, 22221111, 50005000, 51151555, 88877778 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`300 is triangular, and contains the digits 0 and 3`
	CROSSREFS	`Sequence in context: A115708 A068992 A098564 this_sequence A129496 A075520 A030663` `Adjacent sequences: A062688 A062689 A062690 this_sequence A062692 A062693 A062694`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Erich Friedman (efriedma(AT)stetson.edu), Jul 04 2001`

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Last modified December 4 14:15 EST 2008. Contains 151279 sequences.

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