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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.

A290804 One of the two successive approximations up to 7^n for the 7-adic integer sqrt(-3). These are the numbers congruent to 5 mod 7 (except for the initial 0).

Table of values

n a(n)
0 0
1 5
2 12
3 306
4 306
5 2707
6 69935
7 658180
8 4775895
9 10540696
10 10540696
11 575491194
12 4530144680
13 59895293484
14 544340345519
15 1900786491217
16 20891032530989
17 87356893670191
18 319987407657398
19 10090468995120092
20 44287154551239521
21 203871687146463523

List of values

[0, 5, 12, 306, 306, 2707, 69935, 658180, 4775895, 10540696, 10540696, 575491194, 4530144680, 59895293484, 544340345519, 1900786491217, 20891032530989, 87356893670191, 319987407657398, 10090468995120092, 44287154551239521, 203871687146463523]

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

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