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.

A046427 Numbers requiring 7 steps to reach a prime under the prime factor concatenation procedure.

Table of values

n a(n)
1 91
2 128
3 196
4 305
5 344
6 416
7 438
8 456
9 554
10 656
11 690
12 707
13 746
14 750
15 779
16 897
17 910
18 950
19 1014
20 1060
21 1098
22 1122
23 1199
24 1209
25 1247
26 1380
27 1507
28 1545
29 1606
30 1679
31 1680
32 1700
33 1711
34 1769
35 1833
36 1884
37 1887
38 1888
39 1928
40 1971
41 1984
42 2000
43 2169
44 2176
45 2192
46 2198

List of values

[91, 128, 196, 305, 344, 416, 438, 456, 554, 656, 690, 707, 746, 750, 779, 897, 910, 950, 1014, 1060, 1098, 1122, 1199, 1209, 1247, 1380, 1507, 1545, 1606, 1679, 1680, 1700, 1711, 1769, 1833, 1884, 1887, 1888, 1928, 1971, 1984, 2000, 2169, 2176, 2192, 2198]

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

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