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.

A256351 Composites in base 10 that remain composite in exactly seven bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.

Table of values

n a(n)
1 8
2 9
3 15
4 16
5 21
6 22
7 25
8 28
9 34
10 75
11 87
12 91
13 93
14 94
15 106
16 111
17 123
18 141
19 143
20 145
21 147
22 155
23 172
24 201
25 205
26 214
27 217
28 237
29 255
30 298
31 304
32 305
33 363
34 371
35 376
36 377
37 385
38 388
39 395
40 403
41 411
42 423
43 428
44 442
45 458
46 466
47 471
48 473
49 483
50 495
51 501
52 505
53 507
54 531
55 533

List of values

[8, 9, 15, 16, 21, 22, 25, 28, 34, 75, 87, 91, 93, 94, 106, 111, 123, 141, 143, 145, 147, 155, 172, 201, 205, 214, 217, 237, 255, 298, 304, 305, 363, 371, 376, 377, 385, 388, 395, 403, 411, 423, 428, 442, 458, 466, 471, 473, 483, 495, 501, 505, 507, 531, 533]

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

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