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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.

A119761 Values n such that the largest prime factor of repunit R_n=(10^n -1)/9 is a unique prime,i.e.,whose reciprocal has unique decimal period length.

Table of values

n a(n)
1 2
2 3
3 4
4 6
5 9
6 10
7 12
8 14
9 18
10 19
11 23
12 24
13 36
14 38
15 39
16 46
17 48
18 62
19 78
20 93
21 96
22 106
23 120
24 134
25 150
26 186
27 196
28 240
29 268
30 294
31 300
32 317
33 320

List of values

[2, 3, 4, 6, 9, 10, 12, 14, 18, 19, 23, 24, 36, 38, 39, 46, 48, 62, 78, 93, 96, 106, 120, 134, 150, 186, 196, 240, 268, 294, 300, 317, 320]

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

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