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Search: id:A070191
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| A070191 |
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Numbers n such that gcd(3n,8^n+1) = 3. |
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+0
4
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| 1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47, 49, 53, 59, 61, 65, 67, 71, 73, 77, 79, 83, 85, 89, 91, 95, 97, 101, 103, 107, 109, 113, 115, 119, 121, 125, 127, 131, 133, 137, 139, 143, 145, 149, 151, 155, 157, 161, 163, 167, 169, 173, 175, 179, 181
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The listed terms are the same as those in A069040, but the sequences are not identical. (The similarity is mostly explained by the absence of multiples of 2, 3, and 55 from both sequences.) See A070192 and A070193 for the differences.
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MATHEMATICA
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test8[n_] := GCD[3n, PowerMod[8, n, 3n]+1]==3; Select[Range[200], test8]
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CROSSREFS
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Sequence in context: A067291 A007310 A069040 this_sequence A135775 A066047 A020626
Adjacent sequences: A070188 A070189 A070190 this_sequence A070192 A070193 A070194
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr) and Dean Hickerson (dean(AT)math.ucdavis.edu), Apr 26 2002
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