This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A180832 Number of distinct solutions of sum{i=1..9}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2 1
 0, 0, 0, 0, 15, 263, 6946, 95702, 1113010, 9143911, 64448228, 363369141, 1820591529, 7808981077, 30658462967, 107320405217, 351179673988, 1052229547028, 2992063116924, 7932504265966, 20180975666040, 48485253590942 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Column 9 of A180834 LINKS R. H. Hardin, Table of n, a(n) for n=1..183 EXAMPLE Solutions for sum of products of 9 2..3 pairs = 1 (mod 5) are (2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2) (2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 3*3) (2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 3*3 + 3*3) (2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 3*3 + 3*3 + 3*3) (2*2 + 2*2 + 2*2 + 2*2 + 2*3 + 2*3 + 2*3 + 2*3 + 2*3) (2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 3*3 + 3*3 + 3*3 + 3*3) (2*2 + 2*2 + 2*2 + 2*2 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3) (2*2 + 2*2 + 2*2 + 2*3 + 2*3 + 2*3 + 2*3 + 2*3 + 3*3) (2*2 + 2*2 + 2*2 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3) (2*2 + 2*2 + 2*3 + 2*3 + 2*3 + 2*3 + 2*3 + 3*3 + 3*3) (2*2 + 2*2 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3) (2*2 + 2*3 + 2*3 + 2*3 + 2*3 + 2*3 + 3*3 + 3*3 + 3*3) (2*2 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3) (2*3 + 2*3 + 2*3 + 2*3 + 2*3 + 3*3 + 3*3 + 3*3 + 3*3) (3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3 + 3*3) CROSSREFS Sequence in context: A099273 A206230 A209263 * A013381 A013384 A013380 Adjacent sequences:  A180829 A180830 A180831 * A180833 A180834 A180835 KEYWORD nonn AUTHOR R. H. Hardin Sep 20 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .