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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.

A274568 Irregular triangle read by rows in which the n-th row (n>1) lists distinct "factors" of n for the sieve described in A262775.

Table of values

n a(n)
0 2
1 0
2 2
3 3
4 7
5 2
6 3
7 2
8 9
9 2
10 3
11 13
12 2
13 7
14 3
15 2
16 15
17 2
18 3
19 19
20 2
21 9
22 3
23 7
24 2
25 21
26 2
27 3
28 27
29 2
30 13
31 3
32 2
33 7
34 9
35 2
36 3
37 33
38 2
39 15
40 3
41 2
42 7
43 2
44 3
45 37
46 2
47 9
48 19
49 3
50 13
51 2
52 39
53 2
54 3
55 7
56 49
57 2
58 21
59 3
60 2
61 9
62 15
63 2
64 3
65 7
66 2
67 3
68 2
69 13
70 27
71 51
72 2
73 3
74 55
75 2
76 7
77 9
78 3
79 19

List of values

[2, 0, 2, 3, 7, 2, 3, 2, 9, 2, 3, 13, 2, 7, 3, 2, 15, 2, 3, 19, 2, 9, 3, 7, 2, 21, 2, 3, 27, 2, 13, 3, 2, 7, 9, 2, 3, 33, 2, 15, 3, 2, 7, 2, 3, 37, 2, 9, 19, 3, 13, 2, 39, 2, 3, 7, 49, 2, 21, 3, 2, 9, 15, 2, 3, 7, 2, 3, 2, 13, 27, 51, 2, 3, 55, 2, 7, 9, 3, 19]

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

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