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.

A249627 Product of the lowest and highest prime factors of n-th repunit A002275(n).

Table of values

n a(n)
2 121
3 111
4 1111
5 11111
6 111
7 1111111
8 1507
9 1001001
10 100001
11 11111111111
12 29703
13 14064697609
14 10000001
15 8718483
16 64705883
17 11111111111111111
18 1001001
19 1234567901234567900987654320987654321
20 307571
21 32516067
22 5645629
23 123456790123456790123454320987654320987654321

List of values

[121, 111, 1111, 11111, 111, 1111111, 1507, 1001001, 100001, 11111111111, 29703, 14064697609, 10000001, 8718483, 64705883, 11111111111111111, 1001001, 1234567901234567900987654320987654321, 307571, 32516067, 5645629, 123456790123456790123454320987654320987654321]

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

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