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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.

A071423 a(n) = a(n-1) + number of decimal digits of 2^n. Number of decimal digits of concatenation of first n powers of 2.

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 7
6 9
7 12
8 15
9 18
10 22
11 26
12 30
13 34
14 39
15 44
16 49
17 55
18 61
19 67
20 74
21 81
22 88
23 95
24 103
25 111
26 119
27 128
28 137
29 146
30 156
31 166
32 176
33 186
34 197
35 208
36 219
37 231
38 243
39 255
40 268
41 281
42 294
43 307
44 321
45 335
46 349
47 364
48 379
49 394
50 410
51 426
52 442
53 458
54 475
55 492
56 509
57 527
58 545

List of values

[1, 2, 3, 5, 7, 9, 12, 15, 18, 22, 26, 30, 34, 39, 44, 49, 55, 61, 67, 74, 81, 88, 95, 103, 111, 119, 128, 137, 146, 156, 166, 176, 186, 197, 208, 219, 231, 243, 255, 268, 281, 294, 307, 321, 335, 349, 364, 379, 394, 410, 426, 442, 458, 475, 492, 509, 527, 545]

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

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