id:A119105 - OEIS Search Results

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A119105

Triangular numbers composed of digits {1,2,7}.

+0
3

1, 21, 171, 1711, 2211, 72771, 121771, 222111, 712221, 22221111, 72222171, 2222211111, 12177127711, 72177771711, 171277217121, 222222111111, 22222221111111, 121727717277211, 2222222211111111, 22117121117271271 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`G. Resta, Tridigital Triangular Numbers`
	CROSSREFS	`Cf. A000217, A053885, A119106. See A119033 for a table of cross-references.` `Sequence in context: A125358 A126516 A007261 this_sequence A015880 A113163 A090021` `Adjacent sequences: A119102 A119103 A119104 this_sequence A119106 A119107 A119108`
	KEYWORD	`nonn,base`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), May 10 2006`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

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