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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.

A023404 If any power of 2 ends with k 4's and 7's, they must be the first k terms of this sequence in reverse order.

Table of values

n a(n)
1 4
2 4
3 7
4 7
5 4
6 4
7 4
8 4
9 4
10 4
11 7
12 4
13 4
14 4
15 4
16 7
17 7
18 4
19 7
20 7
21 7
22 4
23 7
24 4
25 4
26 7
27 4
28 7
29 4
30 4
31 7
32 7
33 4
34 4
35 7
36 4
37 7
38 7
39 4
40 4
41 4
42 4
43 4
44 4
45 7
46 4
47 7
48 4
49 4
50 4
51 4
52 4
53 7
54 4
55 7
56 4
57 4
58 7
59 7
60 4
61 4
62 4
63 7
64 4
65 7
66 7
67 4
68 4
69 4
70 7
71 7
72 4
73 7
74 4
75 4
76 7
77 4
78 7
79 7
80 7
81 7
82 7
83 4
84 7
85 7
86 7
87 7
88 7
89 7
90 7
91 4
92 4
93 4
94 4
95 4
96 7
97 4
98 7
99 4
100 7
101 7
102 4
103 7
104 7
105 7
106 4
107 4
108 4

List of values

[4, 4, 7, 7, 4, 4, 4, 4, 4, 4, 7, 4, 4, 4, 4, 7, 7, 4, 7, 7, 7, 4, 7, 4, 4, 7, 4, 7, 4, 4, 7, 7, 4, 4, 7, 4, 7, 7, 4, 4, 4, 4, 4, 4, 7, 4, 7, 4, 4, 4, 4, 4, 7, 4, 7, 4, 4, 7, 7, 4, 4, 4, 7, 4, 7, 7, 4, 4, 4, 7, 7, 4, 7, 4, 4, 7, 4, 7, 7, 7, 7, 7, 4, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 4, 4, 7, 4, 7, 4, 7, 7, 4, 7, 7, 7, 4, 4, 4]

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