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A015638 Number of ordered quadruples of integers from [ 2,n ] with no global factor. +0
1
0, 3, 9, 28, 50, 105, 169, 279, 406, 625, 839, 1202, 1570, 2086, 2646, 3461, 4219, 5358, 6452, 7899, 9381, 11404, 13240, 15805, 18272, 21383, 24461, 28520, 32107, 37066, 41706, 47395, 52968, 59990, 66312, 74747, 82553, 91969, 100989, 112468 (list; graph; listen)
OFFSET

2,2

CROSSREFS

Sequence in context: A061582 A102558 A022767 this_sequence A032092 A026524 A022631

Adjacent sequences: A015635 A015636 A015637 this_sequence A015639 A015640 A015641

KEYWORD

nonn

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com)

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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