id:A119149 - OEIS Search Results

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

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

	OFFSET	`1,2`
	COMMENT	`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: A131019 A037158 A066469 this_sequence A118845 A050717 A088184` `Adjacent sequences: A119146 A119147 A119148 this_sequence 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 July 26 23:19 EDT 2008. Contains 142293 sequences.