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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.

A078260 a(n) = denominator(N), where N = 0.246...(2n) is the concatenation of the first n even numbers after decimal point.

Table of values

n a(n)
1 5
2 25
3 500
4 2500
5 100000
6 25000000
7 5000000000
8 125000000000
9 50000000000000
10 500000000000000
11 500000000000000000
12 6250000000000000000
13 5000000000000000000000
14 250000000000000000000000
15 10000000000000000000000000
16 1250000000000000000000000000
17 500000000000000000000000000000

List of values

[5, 25, 500, 2500, 100000, 25000000, 5000000000, 125000000000, 50000000000000, 500000000000000, 500000000000000000, 6250000000000000000, 5000000000000000000000, 250000000000000000000000, 10000000000000000000000000, 1250000000000000000000000000, 500000000000000000000000000000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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