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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.

A290806 One of the two successive approximations up to 7^n for the 7-adic integer sqrt(-5). 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 17
3 311
4 997
5 3398
6 20205
7 608450
8 2255536
9 25314740
10 25314740
11 307789989
12 8217096961
13 77423532966
14 368090564187
15 4437429001281
16 4437429001281
17 4437429001281
18 4437429001281
19 3261264624822179
20 3261264624822179
21 3261264624822179
22 1120352992791390193

List of values

[0, 3, 17, 311, 997, 3398, 20205, 608450, 2255536, 25314740, 25314740, 307789989, 8217096961, 77423532966, 368090564187, 4437429001281, 4437429001281, 4437429001281, 4437429001281, 3261264624822179, 3261264624822179, 3261264624822179, 1120352992791390193]

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

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