A003574 Order of 4 mod 4n-1.

1, 3, 5, 2, 9, 11, 9, 5, 6, 6, 7, 23, 4, 10, 29, 3, 33, 35, 10, 39, 41, 14, 6, 18, 15, 51, 53, 18, 22, 12, 10, 7, 65, 18, 69, 30, 21, 15, 10, 26, 81, 83, 9, 30, 89, 30, 20, 95, 6, 99, 42, 33, 105, 14, 9, 37, 113, 15, 46, 119

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Muniru A Asiru, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A003573. Second bisection of A053447.

Cf. A002326, A003572, A217852.

Programs

GAP

List([1..70],n->OrderMod(4,4*n-1)); # Muniru A Asiru, Feb 19 2019

Maple

with(numtheory): f := n->order(4,4*n-1);

PARI

a(n) = znorder(Mod(4, 4*n-1)); \\ Michel Marcus, Feb 22 2019

Formula

a(n) = A053447(2*n-1) for n >= 1. - Jianing Song, Oct 03 2022