cp's OEIS Frontend

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.

A083221 Sieve of Eratosthenes arranged as an array and read by antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...

Table of values

n a(n)
2 2
3 4
4 3
5 6
6 9
7 5
8 8
9 15
10 25
11 7
12 10
13 21
14 35
15 49
16 11
17 12
18 27
19 55
20 77
21 121
22 13
23 14
24 33
25 65
26 91
27 143
28 169
29 17
30 16
31 39
32 85
33 119
34 187
35 221
36 289
37 19
38 18
39 45
40 95
41 133
42 209
43 247
44 323
45 361
46 23
47 20
48 51
49 115
50 161
51 253
52 299
53 391
54 437
55 529
56 29
57 22
58 57
59 125
60 203
61 319
62 377
63 493
64 551
65 667

List of values

[2, 4, 3, 6, 9, 5, 8, 15, 25, 7, 10, 21, 35, 49, 11, 12, 27, 55, 77, 121, 13, 14, 33, 65, 91, 143, 169, 17, 16, 39, 85, 119, 187, 221, 289, 19, 18, 45, 95, 133, 209, 247, 323, 361, 23, 20, 51, 115, 161, 253, 299, 391, 437, 529, 29, 22, 57, 125, 203, 319, 377, 493, 551, 667]

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

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