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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.

A290800 One of the two successive approximations up to 7^n for the 7-adic integer sqrt(-6). These are the numbers congruent to 1 mod 7 (except for the initial 0).

Table of values

n a(n)
0 0
1 1
2 22
3 120
4 120
5 9724
6 26531
7 144180
8 144180
9 17438583
10 259560225
11 259560225
12 259560225
13 83307283431
14 180196293838
15 2893088585234
16 17135773115063
17 116834564823866
18 582095592798280
19 10352577180260974
20 55948157921753546
21 454909489409813551

List of values

[0, 1, 22, 120, 120, 9724, 26531, 144180, 144180, 17438583, 259560225, 259560225, 259560225, 83307283431, 180196293838, 2893088585234, 17135773115063, 116834564823866, 582095592798280, 10352577180260974, 55948157921753546, 454909489409813551]

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

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