A277350 Positive integers n such that 5^n == 6 (mod n).

1, 15853, 5520343, 111966563, 2232207889, 5551501871

Offset: 1

Author

Seiichi Manyama, Oct 10 2016

Keywords

• nonn
• hard
• more

Comments

No other terms below 10^15. - Max Alekseyev, Oct 18 2016

Crossrefs

Cf. Solutions to 5^n == k (mod n): A277348 (k=-6), A015891 (k=-5), A123047 (k=-4), A123052 (k=-3), A123062 (k=-2), A015951 (k=-1), A067946 (k=1), A124246 (k=2), A123061 (k=3), A125949 (k=4), A123091 (k=5), this sequence (k=6).

Programs

PARI

isok(n) = Mod(5, n)^n == 6; \\ Michel Marcus, Oct 10 2016