A333340 a(n) is the smallest positive number k such that n divides 4^k - k.

1, 2, 1, 4, 6, 4, 2, 8, 4, 6, 14, 4, 22, 2, 16, 16, 21, 4, 25, 16, 4, 14, 26, 16, 19, 22, 13, 4, 16, 16, 33, 32, 82, 50, 36, 4, 84, 62, 22, 16, 18, 4, 16, 100, 49, 26, 122, 16, 65, 46, 52, 68, 7, 40, 26, 88, 25, 16, 19, 16, 3, 66, 4, 64, 66, 82, 127, 52, 94, 36

Offset

1,2

Links

Table of n, a(n) for n=1..70.

Formula

a(4^m) = 4^m for m >= 0.

Prog

(PARI) a(n) = for(k=1, oo, if(Mod(4, n)^k==k, return(k)));

Crossrefs

Cf. A072872, A333335, A333339, A333341.

Sequence in context: A143897 A217298 A217299 * A217300 A036662 A134306

Adjacent sequences: A333337 A333338 A333339 * A333341 A333342 A333343

Keyword

nonn

Author

Jinyuan Wang, Apr 14 2020

Status

approved