A013837 a(n) = 5^(5*n + 4).

625, 1953125, 6103515625, 19073486328125, 59604644775390625, 186264514923095703125, 582076609134674072265625, 1818989403545856475830078125, 5684341886080801486968994140625, 17763568394002504646778106689453125

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), A016897 (5*n+4).

Programs

Magma

[5^(5*n+4): n in [0..15]]; // Vincenzo Librandi, Jul 07 2011

Formula

From Philippe Deléham, Dec 03 2008: (Start)

a(n) = 3125*a(n-1), n > 0; a(0)=625.

G.f.: 625/(1-3125*x). (End)