id:A085141 - OEIS Search Results

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Greatest nonnegative integer k such that k(3k+1)/2 <= n.

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0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8 (list; graph; listen)

	OFFSET	`0,8`
	FORMULA	`a(n)=floor((sqrt(24n+1)-1)/6).`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, (sqrtint(24*n+1)-1)\6)`
	CROSSREFS	`n=a(A005449(n)).` `Sequence in context: A000193 A059939 A071842 this_sequence A082896 A079416 A135664` `Adjacent sequences: A085138 A085139 A085140 this_sequence A085142 A085143 A085144`
	KEYWORD	`nonn`
	AUTHOR	`Michael Somos, Jun 19 2003`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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