A015645 - OEIS

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A015645

Number of 5-tuples of different integers from [ 2,n ] with no common factors among quadruples.

0

0, 0, 0, 0, 1, 6, 18, 52, 105, 226, 374, 688, 1047, 1690, 2406, 3696, 4901, 7140, 9291, 12688, 16091, 21710, 26434, 34648, 42081, 53026, 63410, 79828, 92681, 114846, 133893, 160907, 185809, 223366, 252656, 301436, 342197, 398606, 448676

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OFFSET

2,6

LINKS

Table of n, a(n) for n=2..40.

CROSSREFS

Sequence in context: A318160 A220227 A075650 * A001216 A318484 A079843

Adjacent sequences: A015642 A015643 A015644 * A015646 A015647 A015648

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved