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.

A261170 Number of decimal digits of A260871(n), where A260871 lists primes whose base-b representation is the concatenation of the base-b representations of (1, 2, ..., k, k-1, ..., 1).

Table of values

n a(n)
1 2
2 3
3 4
4 5
5 7
6 9
7 17
8 20
9 31
10 38
11 43
12 64
13 64
14 70
15 91
16 93
17 102
18 117
19 120
20 123
21 127
22 127
23 127
24 136
25 160
26 166
27 176
28 235
29 321
30 351
31 353
32 389
33 403
34 418
35 418
36 421
37 422
38 466
39 542
40 578
41 579
42 703
43 706
44 725
45 731
46 765
47 780
48 792
49 795
50 799
51 803
52 839
53 840
54 848
55 849
56 863

List of values

[2, 3, 4, 5, 7, 9, 17, 20, 31, 38, 43, 64, 64, 70, 91, 93, 102, 117, 120, 123, 127, 127, 127, 136, 160, 166, 176, 235, 321, 351, 353, 389, 403, 418, 418, 421, 422, 466, 542, 578, 579, 703, 706, 725, 731, 765, 780, 792, 795, 799, 803, 839, 840, 848, 849, 863]

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

Content is available under The OEIS End-User License Agreement.