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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.

A259266 a(n) is the unique odd-valued residue modulo 5^n of a number m such that m^2+1 is divisible by 5^n.

Table of values

n a(n)
1 3
2 7
3 57
4 443
5 2057
6 14557
7 45807
8 110443
9 1672943
10 6139557
11 25670807
12 123327057
13 123327057
14 5006139557
15 19407922943
16 102662389557
17 407838170807
18 3459595983307
19 3459595983307
20 79753541295807
21 110981321985443
22 110981321985443
23 9647724486047943
24 9647724486047943

List of values

[3, 7, 57, 443, 2057, 14557, 45807, 110443, 1672943, 6139557, 25670807, 123327057, 123327057, 5006139557, 19407922943, 102662389557, 407838170807, 3459595983307, 3459595983307, 79753541295807, 110981321985443, 110981321985443, 9647724486047943, 9647724486047943]

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

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