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A064136
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Number of divisors of 11^n + 1 that are relatively prime to 11^m + 1 for all 0 < m < n.
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0
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2, 2, 2, 2, 2, 2, 4, 2, 4, 2, 2, 16, 4, 8, 8, 4, 4, 8, 2, 16, 4, 2, 4, 16, 16, 4, 2, 4, 16, 8, 2, 16, 8, 16, 16, 48, 8, 4, 4, 8, 4, 8, 4, 4, 16, 8, 16, 16, 4, 16, 8, 8, 2, 16, 16, 32
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Sam Wagstaff, Cunningham Project, Factorizations of 11^n-1, n<=240
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MATHEMATICA
| a = {1}; Do[ d = Divisors[ 11^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[ 11^n + 1 ] ][ [ 1 ] ] ] ] ], {n, 0, 55} ]
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CROSSREFS
| Sequence in context: A104369 A051702 A073130 * A143526 A072924 A036263
Adjacent sequences: A064133 A064134 A064135 * A064137 A064138 A064139
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 10 2001
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