A072050 Smallest solution to GCD(x,A004086(x))=7^n.

7, 18718, 343, 125204947, 231012215, 11298657013, 211066659013, 117088913464607, 2846847905744815, 108244538579770418, 2080795357577501075, 18312871825384462928, 26268977180287044053417, 1734582041294009627423816

Offset: 1

Author

Labos Elemer, Jun 10 2002

Keywords

• nonn
• base
• more

Crossrefs

Cf. A004086, A055483, A069554, A071686, A072005, A072021.

Programs

Mathematica

(* See A071686. *)

Formula

a(n) = A069554(7^n).

Extensions

a(8)-a(9) from Max Alekseyev, Jun 17 2011

a(10)-a(14) from Giovanni Resta, Oct 30 2019