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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.

A330979 The squares visited on the Ulam Spiral when starting at square 1 and then stepping to the closest unvisited square which contains a prime number. If two or more squares are the same distance from the current square then the one with the smallest prime number is chosen.

Table of values

n a(n)
1 1
2 2
3 3
4 11
5 29
6 13
7 31
8 59
9 61
10 97
11 139
12 191
13 251
14 193
15 101
16 103
17 67
18 37
19 17
20 5
21 19
22 7
23 23
24 47
25 79
26 163
27 281
28 353
29 283
30 433
31 521
32 617
33 523
34 619
35 439
36 359
37 223
38 167
39 83
40 173
41 229
42 293
43 227
44 367
45 449
46 541
47 743
48 857
49 977
50 853

List of values

[1, 2, 3, 11, 29, 13, 31, 59, 61, 97, 139, 191, 251, 193, 101, 103, 67, 37, 17, 5, 19, 7, 23, 47, 79, 163, 281, 353, 283, 433, 521, 617, 523, 619, 439, 359, 223, 167, 83, 173, 229, 293, 227, 367, 449, 541, 743, 857, 977, 853]

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

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