id:A077291 - OEIS Search Results

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Second member of Diophantine pair (m,k) that solves 6*(m^2+m)=k^2+k: a(n)=k.

+0
4

0, 3, 8, 35, 84, 351, 836, 3479, 8280, 34443, 81968, 340955, 811404, 3375111 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`The first members m are in A077288`
	FORMULA	`Let b(n) be A077290. Then a(n)=(-1+sqrt(8*b(n)+1))/2`
	EXAMPLE	`b(3)=630 so a(3)=(-1+sqrt(8*630+1))/2=(-1+sqrt(5041))/2=(71-1)/2=35`
	CROSSREFS	`Cf. A077288, A077289, A077290.` `Sequence in context: A094448 A063805 A125046 this_sequence A020099 A005635 A026649` `Adjacent sequences: A077288 A077289 A077290 this_sequence A077292 A077293 A077294`
	KEYWORD	`easy,nonn`
	AUTHOR	`Bruce Corrigan (scentman(AT)myfamily.com), Nov 03 2002`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.