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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.

A215470 Prime intersections in a square spiral with positive integers: primes p such that there are four primes among eight nearest neighbors of p.

Table of values

n a(n)
1 71
2 353
3 701
4 1151
5 1451
6 3347
7 4691
8 13463
9 21017
10 27947
11 34337
12 42017
13 52253
14 57191
15 79907
16 80831
17 81611
18 121469
19 144497
20 159737
21 161141
22 256301
23 265547
24 284231
25 285707
26 312161
27 334511
28 346559
29 348617
30 382601
31 392069
32 422867
33 440303
34 502013
35 541061
36 545873
37 593207

List of values

[71, 353, 701, 1151, 1451, 3347, 4691, 13463, 21017, 27947, 34337, 42017, 52253, 57191, 79907, 80831, 81611, 121469, 144497, 159737, 161141, 256301, 265547, 284231, 285707, 312161, 334511, 346559, 348617, 382601, 392069, 422867, 440303, 502013, 541061, 545873, 593207]

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

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