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

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

Offset: 1

Author

Jon E. Schoenfield, May 26 2007

Keywords

• nonn
• more

Comments

No other terms below 10^15.

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

Links

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

Crossrefs

Cf. A130421.

Programs

PARI

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

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