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A186976 Number of ordered quintuples of distinct pairwise coprime positive integers with largest element n. 4
2, 1, 3, 0, 26, 1, 72, 9, 14, 29, 228, 15, 431, 55, 115, 75, 928, 70, 743, 205, 633, 225, 2499, 70, 3571, 958, 1085, 728, 1626, 350, 6979, 1231, 2061, 822, 10800, 450, 13978, 2361, 2750, 2772, 20114, 1507, 15718, 2761, 7370, 4422, 33082, 2457, 13971 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 7..200

EXAMPLE

a(7) = 2 because there are 2 ordered quintuples of distinct pairwise coprime positive integers with largest element 7: (1,2,3,5,7), (1,3,4,5,7).

CROSSREFS

Column 5 of triangle A186972. First differences of A015698.

Sequence in context: A160169 A117778 A072127 * A160550 A172038 A226131

Adjacent sequences:  A186973 A186974 A186975 * A186977 A186978 A186979

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 01 2011

STATUS

approved

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Last modified January 17 14:12 EST 2019. Contains 319225 sequences. (Running on oeis4.)