id:A077261 - OEIS Search Results

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Triangular numbers that are 5x another triangular number.

+0
4

0, 15, 105, 4950, 33930, 1594005, 10925475, 513264780, 3517969140, 165269665275, 1132775137725, 53216318953890 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`The triangular numbers that are 1/5 are in A077260`
	FORMULA	`Let b(n)=A077260 then a(n)=5*b(n)`
	EXAMPLE	`a(3)=5*990=4950`
	CROSSREFS	`Cf. A077259, A077260, A077262.` `Adjacent sequences: A077258 A077259 A077260 this_sequence A077262 A077263 A077264` `Sequence in context: A055848 A058085 A060218 this_sequence A012507 A143727 A041426`
	KEYWORD	`easy,nonn`
	AUTHOR	`Bruce Corrigan (scentman(AT)myfamily.com), Nov 01 2002`

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.