|
Search: id:A064137
|
|
|
| A064137 |
|
Number of divisors of 12^n + 1 that are relatively prime to 12^m + 1 for all 0 < m < n. |
|
+0
1
|
|
| 2, 2, 4, 4, 4, 2, 2, 4, 8, 4, 2, 2, 4, 8, 4, 8, 4, 4, 4, 8, 16, 8, 16, 8, 8, 16, 8, 32, 2, 4, 2, 4, 4, 32, 4, 2, 8, 8, 8, 16, 2, 16, 2, 16, 4, 8, 2, 16, 8
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
LINKS
|
Sam Wagstaff, Cunningham Project, Factorizations of 12^n-1, n<=240
|
|
MATHEMATICA
|
a = {1}; Do[ d = Divisors[ 12^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[ 12^n + 1 ] ][ [ 1 ] ] ] ] ], {n, 0, 48} ]
|
|
CROSSREFS
|
Adjacent sequences: A064134 A064135 A064136 this_sequence A064138 A064139 A064140
Sequence in context: A143358 A143729 A006460 this_sequence A104202 A042946 A037202
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 10 2001
|
|
|
Search completed in 0.002 seconds
|
