A013836 a(n) = 5^(5*n + 3).

125, 390625, 1220703125, 3814697265625, 11920928955078125, 37252902984619140625, 116415321826934814453125, 363797880709171295166015625, 1136868377216160297393798828125, 3552713678800500929355621337890625

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..100
• Tanya Khovanova, Recursive Sequences
• Index entries for linear recurrences with constant coefficients, signature (3125).

Crossrefs

Cf. A000351 (5^n), A016885 (5*n+3).

Programs

Magma

[5^(5*n+3): n in [0..15]]; // Vincenzo Librandi, Jul 07 2011

Mathematica

NestList[3125#&,125, 20] (* Harvey P. Dale, Jan 14 2025 *)

PARI

a(n)=5^(5*n+3) \\ Edward Jiang, Sep 06 2014

Formula

From Philippe Deléham, Dec 03 2008: (Start)

a(n) = 3125*a(n-1), n > 0; a(0)=125.

G.f.: 125/(1-3125*x). (End)