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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.

A034821 Concatenations C1 and C2 are both prime (see the comment lines).

Table of values

n a(n)
0 5
1 17
2 103
3 127
4 157
5 191
6 200
7 201
8 202
9 203
10 204
11 205
12 206
13 207
14 208
15 209
16 210
17 227
18 234
19 235
20 236
21 237
22 238
23 258
24 259
25 260
26 261
27 262
28 307
29 347
30 354
31 355
32 356
33 357
34 358
35 431
36 524
37 525
38 526
39 527
40 528
41 529
42 530
43 531
44 532
45 533
46 534
47 535
48 536
49 537
50 538
51 539

List of values

[5, 17, 103, 127, 157, 191, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 227, 234, 235, 236, 237, 238, 258, 259, 260, 261, 262, 307, 347, 354, 355, 356, 357, 358, 431, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539]

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

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