A015641 - OEIS

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A015641

Number of 5-tuples of different integers from [ 2,n ] with no global factor.

0

0, 0, 0, 0, 1, 6, 21, 56, 125, 251, 456, 786, 1266, 1980, 2946, 4311, 6056, 8436, 11370, 15231, 19866, 25851, 32801, 41655, 51786, 64366, 78601, 96151, 115495, 139246, 165286, 196541, 230681, 271585, 315256, 367616, 423461, 489011

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OFFSET

2,6

LINKS

Table of n, a(n) for n=2..39.

CROSSREFS

Sequence in context: A259474 A002817 A132366 * A292950 A282845 A341135

Adjacent sequences: A015638 A015639 A015640 * A015642 A015643 A015644

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved