cp's OEIS Frontend

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.

A309851 Primes formed by concatenating n and 2n-1.

Table of values

n a(n)
1 11
2 23
3 47
4 59
5 1019
6 1223
7 1427
8 1733
9 2039
10 2141
11 2243
12 2447
13 2549
14 2753
15 2957
16 3467
17 3671
18 4079
19 4283
20 4691
21 4793
22 5099
23 52103
24 55109
25 61121
26 65129
27 70139
28 75149
29 77153
30 82163
31 86171
32 95189
33 102203
34 104207
35 112223
36 119237
37 124247
38 130259
39 132263
40 137273
41 145289
42 146291
43 147293
44 149297
45 150299
46 160319

List of values

[11, 23, 47, 59, 1019, 1223, 1427, 1733, 2039, 2141, 2243, 2447, 2549, 2753, 2957, 3467, 3671, 4079, 4283, 4691, 4793, 5099, 52103, 55109, 61121, 65129, 70139, 75149, 77153, 82163, 86171, 95189, 102203, 104207, 112223, 119237, 124247, 130259, 132263, 137273, 145289, 146291, 147293, 149297, 150299, 160319]