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.

A204847 Primitive cofactor of n-th repunit A002275(n).

Table of values

n a(n)
1 1
2 11
3 111
4 101
5 11111
6 91
7 1111111
8 10001
9 333667
10 9091
11 11111111111
12 9901
13 1111111111111
14 909091
15 90090991
16 100000001
17 11111111111111111
18 999001
19 1111111111111111111
20 99009901
21 900900990991
22 826446281
23 11111111111111111111111
24 99990001
25 100001000010000100001

List of values

[1, 11, 111, 101, 11111, 91, 1111111, 10001, 333667, 9091, 11111111111, 9901, 1111111111111, 909091, 90090991, 100000001, 11111111111111111, 999001, 1111111111111111111, 99009901, 900900990991, 826446281, 11111111111111111111111, 99990001, 100001000010000100001]

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

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