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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.

A290557 One of the two successive approximations up to 7^n for the 7-adic integer sqrt(2). These are the numbers congruent to 3 mod 7 (except for the initial 0).

Table of values

n a(n)
0 0
1 3
2 10
3 108
4 2166
5 4567
6 38181
7 155830
8 1802916
9 24862120
10 266983762
11 1961835256
12 5916488742
13 19757775943
14 116646786350
15 116646786350
16 9611769806236
17 42844700375837
18 275475214363044
19 6789129606004840
20 75182500718243698
21 154974767015855699

List of values

[0, 3, 10, 108, 2166, 4567, 38181, 155830, 1802916, 24862120, 266983762, 1961835256, 5916488742, 19757775943, 116646786350, 116646786350, 9611769806236, 42844700375837, 275475214363044, 6789129606004840, 75182500718243698, 154974767015855699]

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

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