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.

A213240 Numbers n such that sum of digits of n = sum of digits of n’, where n’ is the arithmetic derivative of n.

Table of values

n a(n)
1 4
2 22
3 27
4 54
5 56
6 81
7 94
8 108
9 121
10 135
11 166
12 202
13 216
14 243
15 245
16 260
17 265
18 266
19 272
20 274
21 308
22 344
23 346
24 355
25 382
26 405
27 445
28 454
29 459
30 513
31 517
32 518
33 526
34 562
35 567
36 594
37 634
38 648
39 675
40 702
41 706
42 729
43 784
44 806
45 832
46 837
47 841
48 891
49 913
50 920
51 922
52 945
53 950
54 972

List of values

[4, 22, 27, 54, 56, 81, 94, 108, 121, 135, 166, 202, 216, 243, 245, 260, 265, 266, 272, 274, 308, 344, 346, 355, 382, 405, 445, 454, 459, 513, 517, 518, 526, 562, 567, 594, 634, 648, 675, 702, 706, 729, 784, 806, 832, 837, 841, 891, 913, 920, 922, 945, 950, 972]

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

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