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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.

A248711 Concatenations of three numbers A,R,B where R=A+B or R=A-B or R=A*B or R=A/B.

Table of values

n a(n)
1 100
2 101
3 110
4 111
5 121
6 122
7 132
8 133
9 143
10 144
11 154
12 155
13 165
14 166
15 176
16 177
17 187
18 188
19 198
20 199
21 200
22 202
23 211
24 212
25 220
26 221
27 231
28 242
29 253
30 263
31 264
32 275
33 284
34 286
35 297
36 300
37 303
38 312
39 313
40 321
41 330
42 331
43 341
44 352
45 362
46 363
47 374
48 385
49 393
50 396
51 400
52 404
53 413
54 414
55 422
56 431
57 440
58 441
59 451
60 462
61 473
62 482
63 484
64 495
65 500
66 505

List of values

[100, 101, 110, 111, 121, 122, 132, 133, 143, 144, 154, 155, 165, 166, 176, 177, 187, 188, 198, 199, 200, 202, 211, 212, 220, 221, 231, 242, 253, 263, 264, 275, 284, 286, 297, 300, 303, 312, 313, 321, 330, 331, 341, 352, 362, 363, 374, 385, 393, 396, 400, 404, 413, 414, 422, 431, 440, 441, 451, 462, 473, 482, 484, 495, 500, 505]

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

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