login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A117656 Number of solutions to x^(k+2)=x^2 mod n for some k>=1. 0
1, 2, 3, 4, 5, 6, 7, 6, 9, 10, 11, 12, 13, 14, 15, 12, 17, 18, 19, 20, 21, 22, 23, 18, 25, 26, 21, 28, 29, 30, 31, 20, 33, 34, 35, 36, 37, 38, 39, 30, 41, 42, 43, 44, 45, 46, 47, 36, 49, 50, 51, 52, 53, 42, 55, 42, 57, 58, 59, 60, 61, 62, 63, 40, 65, 66, 67, 68, 69, 70, 71, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..72.

S. R. Finch, Idempotents and Nilpotents Modulo n (arXiv:math.NT/0605019)

CROSSREFS

Sequence in context: A161658 A066853 A141258 * A101918 A132125 A102672

Adjacent sequences:  A117653 A117654 A117655 * A117657 A117658 A117659

KEYWORD

mult,nonn

AUTHOR

Steven Finch, Apr 11 2006

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 .

Last modified May 21 01:01 EDT 2013. Contains 225470 sequences.