A130422 Numbers k such that 4^k == 3 (mod k).

1, 137243, 2517961, 117741349, 369940993, 19049924867, 30861256333, 1087115897989, 38969560049629

Offset

1,2

Comments

No other terms below 10^15.

222775558403218644781528238995676668723498240827403019 belongs to this sequence. - Max Alekseyev, Jul 03 2014

Links

Table of n, a(n) for n=1..9.

M. Miller, Digraph covering and its application to two optimization problems for digraphs, Australasian Journal of Combinatorics, 3 (1991), pp. 151-164.

Prog

(PARI) for (n=1, 10^33, if ( Mod(4, n)^n==3, print1(n, ", "))); /* Joerg Arndt, Jun 09 2012 */

Crossrefs

Cf. A130421.

Sequence in context: A253981 A191819 A015071 * A022235 A234225 A110598

Adjacent sequences: A130419 A130420 A130421 * A130423 A130424 A130425

Keyword

nonn,more

Author

Jon E. Schoenfield, May 26 2007

Extensions

a(6) from Jon E. Schoenfield, Sep 30 2013

a(7) from Jared Polzer, Oct 03 2013

a(8)-a(9) from Max Alekseyev, Jul 03 2014

Status

approved