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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.

A257003 Number of Zagier-reduced indefinite quadratic forms over the integers in two variables with discriminants D(n) = A079896(n).

Table of values

n a(n)
1 1
2 2
3 3
4 3
5 5
6 5
7 4
8 6
9 7
10 5
11 7
12 10
13 7
14 10
15 11
16 9
17 7
18 11
19 13
20 7
21 10
22 16
23 12
24 11
25 16
26 13
27 10
28 14
29 21
30 17
31 8
32 15
33 18
34 14
35 18
36 21
37 13
38 12
39 20
40 27
41 11
42 16
43 26
44 18
45 17
46 25
47 23
48 21
49 13
50 20
51 25
52 12
53 20
54 32
55 24
56 18
57 26
58 27
59 18
60 18
61 38
62 31
63 15
64 18
65 33

List of values

[1, 2, 3, 3, 5, 5, 4, 6, 7, 5, 7, 10, 7, 10, 11, 9, 7, 11, 13, 7, 10, 16, 12, 11, 16, 13, 10, 14, 21, 17, 8, 15, 18, 14, 18, 21, 13, 12, 20, 27, 11, 16, 26, 18, 17, 25, 23, 21, 13, 20, 25, 12, 20, 32, 24, 18, 26, 27, 18, 18, 38, 31, 15, 18, 33]

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

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