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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.

A362471 a(n) is the smallest number of 1's used in expressing n as a calculation containing only decimal repunits and operators +, -, * and /.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 5
7 6
8 5
9 4
10 3
11 2
12 3
13 4
14 5
15 6
16 7
17 7
18 6
19 6
20 5
21 5
22 4
23 5
24 5
25 6
26 6
27 7
28 7
29 7
30 6
31 7
32 6
33 5
34 6
35 7
36 6
37 6
38 7
39 7
40 7
41 8
42 7
43 7
44 6
45 7
46 7
47 8
48 7
49 8
50 7
51 8
52 8
53 8
54 7
55 6
56 6
57 7
58 8
59 8
60 7
61 7
62 8
63 8
64 8
65 8
66 7
67 8
68 8
69 8
70 9
71 9
72 8
73 9
74 8
75 9
76 9
77 8
78 8
79 9
80 8
81 8
82 9
83 10
84 9
85 9
86 9
87 8
88 7
89 7

List of values

[1, 2, 3, 4, 5, 5, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 7, 6, 6, 5, 5, 4, 5, 5, 6, 6, 7, 7, 7, 6, 7, 6, 5, 6, 7, 6, 6, 7, 7, 7, 8, 7, 7, 6, 7, 7, 8, 7, 8, 7, 8, 8, 8, 7, 6, 6, 7, 8, 8, 7, 7, 8, 8, 8, 8, 7, 8, 8, 8, 9, 9, 8, 9, 8, 9, 9, 8, 8, 9, 8, 8, 9, 10, 9, 9, 9, 8, 7, 7]

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

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