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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.

A308782 Index of first occurrence of n appearing twice in succession in van Eck's sequence (A181391), or 0 if it never occurs.

Table of values

n a(n)
0 2
1 0
2 8
3 50
4 132
5 414
6 171
7 659
8 96
9 361
10 12311
11 7224
12 5896
13 2954
14 5804
15 72387
16 12756
17 1292
18 4332
19 3715
20 2704
21 1887
22 5780
23 9837
24 11721
25 1094
26 70067
27 32610
28 57658
29 26146
30 167389
31 94957
32 36588
33 19663
34 35588
35 9627
36 108296
37 51653
38 38147
39 54788
40 81871
41 15502

List of values

[2, 0, 8, 50, 132, 414, 171, 659, 96, 361, 12311, 7224, 5896, 2954, 5804, 72387, 12756, 1292, 4332, 3715, 2704, 1887, 5780, 9837, 11721, 1094, 70067, 32610, 57658, 26146, 167389, 94957, 36588, 19663, 35588, 9627, 108296, 51653, 38147, 54788, 81871, 15502]

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

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