A119149 - OEIS

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A119149

Numbers n such that the n-th triangular number contains only digits {1,7,9}.

1, 13, 18, 58, 586, 1258, 58613, 1350538, 1414213, 59517693, 1398413386, 5996665693, 119976657489461 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Next entry must be greater than 1.4*10^16.`
	LINKS	`G. Resta, Tridigital Triangular Numbers`
	CROSSREFS	`Cf. A000217, A119148. See A119034 for a table of cross-references.` `Sequence in context: A037158 A066469 A197704 * A171098 A118845 A050717` `Adjacent sequences: A119146 A119147 A119148 * A119150 A119151 A119152`
	KEYWORD	`nonn,base,more`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), May 10 2006`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.