A116639 Numbers n such that 13^n == 15 (mod n).

1, 2, 14, 22, 1582, 11266, 52766, 76202, 100562, 494371, 641141, 1698494, 66593158, 469296521, 10917186079, 12062558662, 4928050067287, 5315948729617, 29841213777637, 113215787397262, 778590786358582, 787324867879046

Offset

1,2

Comments

No other terms below 10^15. Some large terms: 6991413003775539262, 2360895769139218729155198091. - Max Alekseyev, Oct 15 2016

Links

Table of n, a(n) for n=1..22.

Mathematica

Select[Range[25000000], PowerMod[13, #, # ]==15&] (* Harvey P. Dale, Feb 03 2009 *)

Crossrefs

Cf. A116609, A116611, A116620, A116621, A116622, A116629, A116630, A116631, A116632, A116636, A116638.

Sequence in context: A247035 A069512 A328217 * A220274 A036433 A172048

Adjacent sequences: A116636 A116637 A116638 * A116640 A116641 A116642

Keyword

nonn

Author

Zak Seidov, Feb 19 2006

Extensions

One more term from Harvey P. Dale, Feb 03 2009

Edited by Max Alekseyev, Sep 19 2009

a(14)-a(22) from Max Alekseyev, May 04 2010, Apr 29 2014, Oct 15 2016

Status

approved