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A266697
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Multiplicative order of 2^n mod 2*n+1.
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1
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1, 2, 2, 1, 3, 2, 2, 4, 1, 2, 3, 1, 5, 18, 2, 1, 5, 12, 2, 12, 1, 2, 6, 1, 7, 8, 2, 20, 9, 2, 2, 6, 3, 2, 11, 1, 1, 20, 15, 1, 27, 2, 4, 28, 1, 4, 5, 36, 1, 30, 2, 1, 3, 2, 2, 36, 1, 44, 6, 24, 11, 20, 50, 1, 7, 2, 3, 36, 1, 2, 23, 60, 7, 42, 2, 1, 6, 20, 2
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OFFSET
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0,2
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LINKS
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FORMULA
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MAPLE
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1, seq(numtheory:-order(2^n, 2*n+1), n=1..100); # Robert Israel, Jan 10 2016
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MATHEMATICA
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Table[MultiplicativeOrder[2^n, 2 n + 1], {n, 0, 100}]
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PROG
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(Magma) [1] cat [Modorder(2^n, 2*n+1): n in [1..100]];
(PARI) a(n) = if(n<0, 0, znorder(Mod(2^n, 2*n+1))); \\ Altug Alkan, Jan 04 2016
(GAP) List([0..100], n->OrderMod(2^n, 2*n+1)); # Muniru A Asiru, Feb 25 2019
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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