|
Search: id:A064134
|
|
|
| A064134 |
|
Number of divisors of 7^n + 1 that are relatively prime to 7^m + 1 for all 0 < m < n. |
|
+0
1
|
|
| 2, 1, 3, 2, 2, 4, 4, 4, 4, 2, 4, 4, 8, 4, 2, 2, 4, 2, 2, 4, 4, 4, 8, 2, 2, 2, 4, 2, 16, 2, 4, 8, 8, 4, 8, 16, 8, 4, 2, 8, 8, 16, 2, 128, 8, 16, 16, 2, 8, 128, 16, 8, 8, 16
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
LINKS
|
Sam Wagstaff, Cunningham Project, Factorizations of 7^n-1, n<=301
|
|
MATHEMATICA
|
a = {1}; Do[ d = Divisors[ 7^n + 1 ]; l = Length[ d ]; c = 0; k = 1; While[ k < l + 1, If[ Union[ GCD[ a, d[ [ k ] ] ] ] == {1}, c++ ]; k++ ]; Print[ c ]; a = Union[ Flatten[ Append[ a, Transpose[ FactorInteger[ 7^n + 1 ] ][ [ 1 ] ] ] ] ], {n, 0, 53} ]
|
|
CROSSREFS
|
Sequence in context: A141157 A137948 A120933 this_sequence A054710 A048233 A005679
Adjacent sequences: A064131 A064132 A064133 this_sequence A064135 A064136 A064137
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 10 2001
|
|
|
Search completed in 0.002 seconds
|
