A217852 Multiplicative order of 5 (mod 5*n - 1).

1, 6, 6, 9, 2, 14, 16, 4, 5, 42, 18, 29, 16, 22, 36, 39, 6, 44, 46, 30, 4, 27, 18, 48, 3, 42, 22, 69, 12, 37, 30, 52, 20, 52, 14, 89, 22, 18, 96, 33, 16, 45, 106, 72, 24, 114, 12, 119, 30, 82, 42, 36, 10, 67, 136, 6, 5, 272, 42, 44, 36, 102, 156, 70, 54, 138, 166

Offset: 1

Author

Arkadiusz Wesolowski, Nov 16 2012

Keywords

• nonn

Comments

Least m such that 5*n - 1 divides 5^m - 1.

Links

• Arkadiusz Wesolowski, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Multiplicative Order

Crossrefs

Cf. A002326, A003572, A003574, A128858.

Programs

GAP

List([1..70],n->OrderMod(5,5*n-1)); # Muniru A Asiru, Feb 25 2019

Mathematica

Table[MultiplicativeOrder[5, 5*n - 1], {n, 67}]

PARI

vector(80, n, znorder(Mod(5, 5*n-1))) \\ Michel Marcus, Feb 09 2015