id:A119148 - OEIS Search Results

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A119148

Triangular numbers composed of digits {1,7,9}.

+0
3

1, 91, 171, 1711, 171991, 791911, 1717771191, 911977119991, 999999911791, 1771177919779971, 977779999771199191, 17979999719799917971, 7197199171171779119991779991 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Next entry must be greater than 10^32.`
	LINKS	`G. Resta, Tridigital Triangular Numbers`
	CROSSREFS	`Cf. A000217, A119149. See A119033 for a table of cross-references.` `Adjacent sequences: A119145 A119146 A119147 this_sequence A119149 A119150 A119151` `Sequence in context: A045934 A051347 A113530 this_sequence A037998 A063367 A064904`
	KEYWORD	`nonn,base,more`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), May 10 2006`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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