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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.

A290559 One of the two successive approximations up to 7^n for the 7-adic integer sqrt(2). These are the numbers congruent to 4 mod 7 (except for the initial 0).

Table of values

n a(n)
0 0
1 4
2 39
3 235
4 235
5 12240
6 79468
7 667713
8 3961885
9 15491487
10 15491487
11 15491487
12 7924798459
13 77131234464
14 561576286499
15 4630914723593
16 23621160763365
17 189785813611370
18 1352938383547405
19 4609765579368303
20 4609765579368303
21 403571097067428308

List of values

[0, 4, 39, 235, 235, 12240, 79468, 667713, 3961885, 15491487, 15491487, 15491487, 7924798459, 77131234464, 561576286499, 4630914723593, 23621160763365, 189785813611370, 1352938383547405, 4609765579368303, 4609765579368303, 403571097067428308]

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

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