id:A080982 - OEIS Search Results

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Smallest k such that the k-th triangular number has n^2 as divisor.

+0
3

1, 7, 8, 31, 24, 8, 48, 127, 80, 24, 120, 63, 168, 48, 99, 511, 288, 80, 360, 224, 98, 120, 528, 512, 624, 168, 728, 735, 840, 224, 960, 2047, 242, 288, 49, 1215, 1368, 360, 675, 1024, 1680, 440, 1848, 1088, 324, 528, 2208, 512, 2400, 624, 288, 1183, 2808, 728 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(2^k) = 2^(2*k+1)-1; a(m)=m^2-1 and for odd prime powers m;` `A080983(n)=A000217(a(n)).`
	CROSSREFS	`Cf. A011772.` `Sequence in context: A042023 A041102 A136116 this_sequence A042875 A048064 A122605` `Adjacent sequences: A080979 A080980 A080981 this_sequence A080983 A080984 A080985`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Feb 26 2003`

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

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