A180828 Number of distinct solutions of sum{i=1..5}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2

0, 0, 0, 0, 3, 29, 286, 1252, 5910, 18058, 59820, 147057, 385126, 808153, 1819415, 3419890, 6872235, 11853812, 21945574, 35503801, 61441639, 94283546, 155139350, 227922254, 359372638, 509599423, 774249654, 1067712369, 1574987136

Offset

1,5

Comments

Column 5 of A180834

Links

R. H. Hardin, Table of n, a(n) for n=1..252

Example

Solutions for sum of products of 5 2..3 pairs = 1 (mod 5) are
(2*2 + 2*2 + 2*3 + 2*3 + 2*3) (2*2 + 2*3 + 2*3 + 2*3 + 3*3)
(2*3 + 2*3 + 2*3 + 3*3 + 3*3)

Crossrefs

Sequence in context: A224754 A162928 A124263 * A026130 A026159 A025186

Adjacent sequences: A180825 A180826 A180827 * A180829 A180830 A180831

Keyword

nonn

Author

R. H. Hardin Sep 20 2010

Status

approved