|
|
A180830
|
|
Number of distinct solutions of sum{i=1..7}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2
|
|
1
|
|
|
0, 0, 0, 0, 4, 98, 1634, 13191, 98721, 509796, 2452572, 9324188, 33559304, 102516038, 302010701, 786309831, 1997861579, 4607230060, 10461759080, 21941200490, 45604744028, 88621893721, 171539771106, 313255557883, 571763758062
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,5
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Solutions for sum of products of 7 2..3 pairs = 1 (mod 5) are
(2*2 + 2*2 + 2*2 + 2*3 + 2*3 + 2*3 + 2*3)
(2*2 + 2*2 + 2*3 + 2*3 + 2*3 + 2*3 + 3*3)
(2*2 + 2*3 + 2*3 + 2*3 + 2*3 + 3*3 + 3*3)
(2*3 + 2*3 + 2*3 + 2*3 + 3*3 + 3*3 + 3*3)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|