A013747 a(n) = 10^(3*n + 2).

100, 100000, 100000000, 100000000000, 100000000000000, 100000000000000000, 100000000000000000000, 100000000000000000000000, 100000000000000000000000000, 100000000000000000000000000000, 100000000000000000000000000000000, 100000000000000000000000000000000000

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 (1000).

Crossrefs

Subsequence of A011557 (10^n).

Cf. A013731, A013737, A013746, A016789.

Programs

Magma

[10^(3*n+2): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011

PARI

a(n)=10^(3*n+2) \\ Charles R Greathouse IV, Jul 10 2016

Formula

From Philippe Deléham, Nov 30 2008: (Start)

a(n) = 1000*a(n-1); a(0)=100.

G.f.: 100/(1-1000*x).

a(n) = 10*A013746(n). (End)

From Elmo R. Oliveira, Jul 07 2025: (Start)

E.g.f.: 100*exp(1000*x).

a(n) = A013731(n)*A013737(n) = A011557(A016789(n)). (End)