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.

A105179 Numbers having in decimal representation the same final digit as their largest proper divisor has; a(1) = 1.

Table of values

n a(n)
1 1
2 11
3 15
4 20
5 25
6 31
7 40
8 41
9 45
10 60
11 61
12 71
13 75
14 80
15 100
16 101
17 105
18 120
19 121
20 125
21 131
22 135
23 140
24 143
25 151
26 160
27 165
28 175
29 180
30 181
31 187
32 191
33 195
34 200
35 209
36 211
37 220
38 225
39 240
40 241
41 251
42 253
43 255
44 260
45 271
46 275
47 280
48 281
49 285
50 300
51 311
52 315
53 319
54 320
55 325

List of values

[1, 11, 15, 20, 25, 31, 40, 41, 45, 60, 61, 71, 75, 80, 100, 101, 105, 120, 121, 125, 131, 135, 140, 143, 151, 160, 165, 175, 180, 181, 187, 191, 195, 200, 209, 211, 220, 225, 240, 241, 251, 253, 255, 260, 271, 275, 280, 281, 285, 300, 311, 315, 319, 320, 325]

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

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