A013783 a(n) = 5^(4*n + 3).

125, 78125, 48828125, 30517578125, 19073486328125, 11920928955078125, 7450580596923828125, 4656612873077392578125, 2910383045673370361328125, 1818989403545856475830078125, 1136868377216160297393798828125

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..200
• Tanya Khovanova, Recursive Sequences
• Index entries for linear recurrences with constant coefficients, signature (625).

Crossrefs

Subsequence of A000351.

Programs

Magma

[5^(4*n+3): n in [0..15]]; // Vincenzo Librandi, Jun 28 2011

Mathematica

5^(4*Range[0,20]+3) (* or *) NestList[625#&,125,20] (* Harvey P. Dale, Aug 14 2018 *)

Formula

From Philippe Deléham, Nov 30 2008: (Start)

a(n) = 625*a(n-1); a(0)=125.

G.f.: 125/(1-625*x).

a(n) = 25*A013782(n). (End)