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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.

A290803 One of the two successive approximations up to 7^n for the 7-adic integer sqrt(-3). These are the numbers congruent to 2 mod 7 (except for the initial 0).

Table of values

n a(n)
0 0
1 2
2 37
3 37
4 2095
5 14100
6 47714
7 165363
8 988906
9 29812911
10 271934553
11 1401835549
12 9311142521
13 36993716923
14 133882727330
15 2846775018726
16 12341898038612
17 145273620317016
18 1308426190253051
19 1308426190253051
20 35505111746372480
21 354674176936820484

List of values

[0, 2, 37, 37, 2095, 14100, 47714, 165363, 988906, 29812911, 271934553, 1401835549, 9311142521, 36993716923, 133882727330, 2846775018726, 12341898038612, 145273620317016, 1308426190253051, 1308426190253051, 35505111746372480, 354674176936820484]

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

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