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A070669
Smallest m in range 2..n-1 such that m^4 == 1 mod n, or 1 if no such number exists.
1
1, 1, 2, 3, 2, 5, 6, 3, 8, 3, 10, 5, 5, 13, 2, 3, 4, 17, 18, 3, 8, 21, 22, 5, 7, 5, 26, 13, 12, 7, 30, 7, 10, 13, 6, 17, 6, 37, 5, 3, 9, 13, 42, 21, 8, 45, 46, 5, 48, 7, 4, 5, 23, 53, 12, 13, 20, 17, 58, 7, 11, 61, 8, 15, 8, 23, 66, 13, 22, 13, 70, 17, 27, 31, 7
OFFSET
1,3
LINKS
MAPLE
a:= proc(n) local m;
for m from 2 to n-1 do
if m &^ 4 mod n = 1 then return m fi
od; 1
end:
seq(a(n), n=1..100); # Alois P. Heinz, Jun 29 2014
MATHEMATICA
a[n_] := (For[m = 2, m <= n - 1, m++, If[PowerMod[m, 4, n] == 1, Return[m]]]; 1); Table[a[n], {n, 1, 100}] (* Jean-François Alcover, Jul 20 2015 *)
PROG
(PARI) a(n) = {for (m=2, n-1, if (lift(Mod(m, n)^4) == 1, return (m)); ); return (1); } \\ Michel Marcus, Jun 29 2014
CROSSREFS
Cf. A070667.
Sequence in context: A214571 A135873 A070673 * A218613 A164912 A289386
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 08 2002
STATUS
approved