id:A087359 - OEIS Search Results

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For n > 2, a(n) is the smallest triangular number > a(n-1) and congruent to a(n-1) (mod a(n-2)).

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1, 3, 6, 15, 21, 36, 78, 1770, 2628, 330078, 1160526, 1106921826, 27467109390, 3405462502501956, 464491597897585896, 35168538277628662422146736, 113107978211040574688911417114776, 158163225773885113469535108323447683287341095656 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`a(7) == a(6) (mod a(5)), -> 78 -36 = 42 = 2*21.`
	CROSSREFS	`Cf. A087360.` `Adjacent sequences: A087356 A087357 A087358 this_sequence A087360 A087361 A087362` `Sequence in context: A117748 A061066 A093799 this_sequence A129602 A044888 A006639`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 08 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 19 2005`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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