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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.

A175770 In the sequence of prime numbers, replace all the '3' digits with '1' and vice versa.

Table of values

n a(n)
1 2
2 1
3 5
4 7
5 33
6 31
7 37
8 39
9 21
10 29
11 13
12 17
13 43
14 41
15 47
16 51
17 59
18 63
19 67
20 73
21 71
22 79
23 81
24 89
25 97
26 303
27 301
28 307
29 309
30 331
31 327
32 313
33 317
34 319
35 349
36 353
37 357
38 361
39 367
40 371
41 379
42 383
43 393
44 391
45 397
46 399
47 233
48 221
49 227
50 229
51 211
52 219
53 243
54 253
55 257
56 261
57 269
58 273
59 277

List of values

[2, 1, 5, 7, 33, 31, 37, 39, 21, 29, 13, 17, 43, 41, 47, 51, 59, 63, 67, 73, 71, 79, 81, 89, 97, 303, 301, 307, 309, 331, 327, 313, 317, 319, 349, 353, 357, 361, 367, 371, 379, 383, 393, 391, 397, 399, 233, 221, 227, 229, 211, 219, 243, 253, 257, 261, 269, 273, 277]

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

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