A070676 - OEIS

A070676

Smallest m in range 1..phi(n) such that 3^m == 1 mod n, or 0 if no such number exists.

0, 1, 0, 2, 4, 0, 6, 2, 0, 4, 5, 0, 3, 6, 0, 4, 16, 0, 18, 4, 0, 5, 11, 0, 20, 3, 0, 6, 28, 0, 30, 8, 0, 16, 12, 0, 18, 18, 0, 4, 8, 0, 42, 10, 0, 11, 23, 0, 42, 20, 0, 6, 52, 0, 20, 6, 0, 28, 29, 0, 10, 30, 0, 16, 12, 0, 22, 16, 0, 12, 35, 0, 12, 18, 0, 18, 30, 0

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..78.

MATHEMATICA

Table[SelectFirst[Range[EulerPhi[n]], PowerMod[3, # , n]==1&, 0], {n, 80}] (* The program uses the SelectFirst function from Mathematica version 10 *) (* Harvey P. Dale, Aug 18 2015 *)

PROG

(Magma) [0] cat [Modorder(3, n): n in [2..100]]; // Vincenzo Librandi, Apr 01 2014

CROSSREFS

Cf. A070667-A070675, A002326, A053447, A070677, A070681, A070678, A053451, A070679, A070682, A070680, A070683.

Sequence in context: A323099 A002652 A202541 * A291306 A068451 A131715

Adjacent sequences: A070673 A070674 A070675 * A070677 A070678 A070679

KEYWORD

nonn

AUTHOR

N. J. A. Sloane and Amarnath Murthy, May 08 2002

STATUS

approved