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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.

A120442 P-positions of John H. Conway's "Digit Deletions" game from "On Numbers and Games". Each number is the smallest positive integer that cannot be reduced to an earlier number in the sequence, by performing one of the following two operations: (1) changing one digit to a smaller digit (but not changing the leading digit to 0), or (2) deleting a 0 and all subsequent digits.

Table of values

n a(n)
1 1
2 11
3 20
4 32
5 43
6 54
7 65
8 76
9 87
10 98
11 111
12 120
13 132
14 143
15 154
16 165
17 176
18 187
19 198
20 201
21 210
22 222
23 233
24 244
25 255
26 266
27 277
28 288
29 299
30 300
31 312
32 321
33 334
34 345
35 353
36 367
37 378
38 386
39 402
40 413
41 424
42 431
43 440
44 456
45 468
46 475
47 489
48 497
49 503
50 514

List of values

[1, 11, 20, 32, 43, 54, 65, 76, 87, 98, 111, 120, 132, 143, 154, 165, 176, 187, 198, 201, 210, 222, 233, 244, 255, 266, 277, 288, 299, 300, 312, 321, 334, 345, 353, 367, 378, 386, 402, 413, 424, 431, 440, 456, 468, 475, 489, 497, 503, 514]

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

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