cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

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

Original entry on oeis.org

100, 100000, 100000000, 100000000000, 100000000000000, 100000000000000000, 100000000000000000000, 100000000000000000000000, 100000000000000000000000000, 100000000000000000000000000000, 100000000000000000000000000000000, 100000000000000000000000000000000000
Offset: 0

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Subsequence of A011557 (10^n).

Programs

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)

A013766 a(n) = 20^(3*n + 1).

Original entry on oeis.org

20, 160000, 1280000000, 10240000000000, 81920000000000000, 655360000000000000000, 5242880000000000000000000, 41943040000000000000000000000, 335544320000000000000000000000000, 2684354560000000000000000000000000000, 21474836480000000000000000000000000000000
Offset: 0

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Subsequence of A009964.

Programs

Formula

From Elmo R. Oliveira, Feb 27 2025: (Start)
G.f.: 20/(1 - 8000*x).
E.g.f.: 20*exp(8000*x).
a(n) = A013730(n)*A013746(n) = A009964(A016777(n)). (End)
Showing 1-2 of 2 results.