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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.

A073030 Sum_{k=1..n, gcd(n,k) = 1} 10^(k-1).

Table of values

n a(n)
2 1
3 11
4 101
5 1111
6 10001
7 111111
8 1010101
9 11011011
10 101000101
11 1111111111
12 10001010001
13 111111111111
14 1010100010101
15 11010011001011
16 101010101010101
17 1111111111111111
18 10001010001010001
19 111111111111111111

List of values

[1, 11, 101, 1111, 10001, 111111, 1010101, 11011011, 101000101, 1111111111, 10001010001, 111111111111, 1010100010101, 11010011001011, 101010101010101, 1111111111111111, 10001010001010001, 111111111111111111]

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

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