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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.

A124049 a(n) = c is least number such that 10^n/2 -/+ c are primes.

Table of values

n a(n)
1 0
2 3
3 9
4 81
5 123
6 57
7 87
8 243
9 69
10 63
11 189
12 231
13 1569
14 381
15 231
16 1443
17 1113
18 321
19 339
20 1353
21 363
22 519
23 1323
24 1503
25 741
26 1221
27 957
28 1053
29 339
30 5931
31 2121
32 2301
33 2031
34 4773
35 4737
36 10281
37 1317
38 129
39 3873
40 1443
41 387
42 11769
43 8271
44 5337
45 2883
46 7137
47 8193
48 8493

List of values

[0, 3, 9, 81, 123, 57, 87, 243, 69, 63, 189, 231, 1569, 381, 231, 1443, 1113, 321, 339, 1353, 363, 519, 1323, 1503, 741, 1221, 957, 1053, 339, 5931, 2121, 2301, 2031, 4773, 4737, 10281, 1317, 129, 3873, 1443, 387, 11769, 8271, 5337, 2883, 7137, 8193, 8493]

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

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