A077399 - OEIS

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A077399

Triangular numbers that are 1/7 of triangular numbers.

0, 3, 15, 780, 3828, 198135, 972315, 50325528, 246964200, 12782485995, 62727934503, 3246701117220, 15932648399580 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`Let b(n) be A077398 then a(n)=b(n)*(b(n)+1)/2`
	CROSSREFS	`Cf. A077398, A077400, A077401.` `Sequence in context: A122579 A138303 A167220 * A013409 A013408 A013412` `Adjacent sequences: A077396 A077397 A077398 * A077400 A077401 A077402`
	KEYWORD	`easy,nonn`
	AUTHOR	`Bruce Corrigan (scentman(AT)myfamily.com), Nov 05 2002`

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.