

A116639


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


13



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



