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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.

A362074 a(n) is the rank of the n X n symmetric matrix M(n) whose generic element M[i,j] = digsum(i*j).

Table of values

n a(n)
1 1
2 1
3 1
4 3
5 5
6 6
7 7
8 7
9 7
10 7
11 7
12 9
13 11
14 11
15 13
16 14
17 15
18 16
19 18
20 18
21 18
22 19
23 19
24 21
25 23
26 24
27 25
28 26
29 27
30 27
31 28
32 29
33 30
34 31
35 32
36 33
37 34
38 35
39 36
40 36
41 37
42 38
43 39
44 40
45 41
46 42
47 43
48 44
49 45
50 45
51 46
52 47
53 48
54 49
55 50
56 51
57 52
58 53
59 54
60 54
61 55
62 56
63 57
64 58
65 59
66 60
67 61
68 62
69 63

List of values

[1, 1, 1, 3, 5, 6, 7, 7, 7, 7, 7, 9, 11, 11, 13, 14, 15, 16, 18, 18, 18, 19, 19, 21, 23, 24, 25, 26, 27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63]

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

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