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.

A215258 Smallest number h such that (2n+1)*h is a repunit (A002275), or 0 if no such h exists.

Table of values

n a(n)
0 1
1 37
2 0
3 15873
4 12345679
5 1
6 8547
7 0
8 65359477124183
9 5847953216374269
10 5291
11 48309178743961352657
12 0
13 4115226337448559670781893
14 38314176245210727969348659
15 3584229390681
16 3367
17 0
18 3
19 2849
20 271
21 2583979328165374677
22 0

List of values

[1, 37, 0, 15873, 12345679, 1, 8547, 0, 65359477124183, 5847953216374269, 5291, 48309178743961352657, 0, 4115226337448559670781893, 38314176245210727969348659, 3584229390681, 3367, 0, 3, 2849, 271, 2583979328165374677, 0]

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

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