A094922 a(n) = (7^n-1)/6 mod n.

0, 0, 0, 0, 1, 0, 1, 0, 0, 8, 1, 0, 1, 8, 12, 0, 1, 0, 1, 0, 15, 8, 1, 0, 1, 8, 0, 8, 1, 18, 1, 0, 24, 8, 22, 0, 1, 8, 18, 0, 1, 36, 1, 4, 36, 8, 1, 0, 8, 8, 6, 36, 1, 0, 7, 8, 0, 8, 1, 0, 1, 8, 36, 0, 6, 6, 1, 60, 57, 8, 1, 0, 1, 8, 57, 20, 43, 30, 1, 0, 0, 8, 1, 36, 81, 8, 57, 16, 1, 18, 29, 32, 57

Offset: 1

Author

N. J. A. Sloane, Jun 18 2004

Keywords

• nonn
• look

Links

• Antti Karttunen, Table of n, a(n) for n = 1..20000

Programs

PARI

A094922(n) = ((((7^n)-1)/6)%n); \\ Antti Karttunen, Feb 18 2023