|
| |
|
|
A081727
|
|
Length of periods of Euler numbers modulo n.
|
|
1
| |
|
|
1, 1, 2, 1, 2, 2, 6, 4, 6, 2, 10, 2, 6, 6, 2, 8, 8, 6, 18, 2, 6, 10, 22, 4, 10, 6, 18, 6, 14, 2, 30, 16, 10, 8, 6, 6, 18, 18, 6, 4
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,3
|
|
|
FORMULA
| a(n)=n-1 if n=2, 3, 7, 11, 19, 23, 31...is a prime == 2 or 3 (mod 4) (A045326)
|
|
|
EXAMPLE
| A000364 modulo 5 gives : 1,1,0,1,0,1,0,1,0,1,0,... with period (1,0) of length 2, hence a(5)=2.
|
|
|
CROSSREFS
| Cf. A000364, A045326.
Sequence in context: A200745 A067541 A054706 * A000020 A077014 A093655
Adjacent sequences: A081724 A081725 A081726 * A081728 A081729 A081730
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2003
|
| |
|
|
