A015963 Numbers k such that k | 13^k + 1.

1, 2, 7, 10, 34, 49, 50, 170, 203, 250, 343, 578, 850, 1250, 1421, 2401, 2890, 4210, 4250, 5887, 6010, 6250, 6410, 9826, 9947, 11977, 14450, 16807, 21050, 21250, 30050, 31250, 32050, 34714, 41209, 49130, 69629, 71570, 72250, 83839, 102170

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..300

Crossrefs

Solutions to 13^n == k (mod n): this sequence (k=-1), A116621 (k=1), A116622 (k=2), A116629 (k=3), A116630 (k=4), A116611 (k=5), A116631 (k=6), A116632 (k=7), A295532 (k=8), A116636 (k=9), A116620 (k=10), A116638 (k=11), A116639 (k=15).

Column k=13 of A333429.

Programs

Mathematica

Select[Range[102170], Divisible[13^# + 1, #] &] (* Robert Price, Apr 10 2020 *)