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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.

A137094 Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 7.

Table of values

n a(n)
1 2
2 5
3 24
4 25
5 26
6 65
7 74
8 75
9 76
10 275
11 474
12 475
13 476
14 524
15 525
16 526
17 665
18 674
19 675
20 725
21 2574
22 2725
23 2765
24 4762
25 6524
26 6525
27 6665
28 6674
29 6675
30 6725
31 6742
32 6762
33 6765
34 7242
35 7465
36 7525
37 27525
38 47725
39 52465
40 52675
41 66524
42 66525
43 66665
44 66674
45 66675
46 66725
47 66765
48 67426
49 67574
50 72426
51 72475
52 72576
53 74475
54 74476
55 75674
56 254275
57 254475
58 255475
59 256266

List of values

[2, 5, 24, 25, 26, 65, 74, 75, 76, 275, 474, 475, 476, 524, 525, 526, 665, 674, 675, 725, 2574, 2725, 2765, 4762, 6524, 6525, 6665, 6674, 6675, 6725, 6742, 6762, 6765, 7242, 7465, 7525, 27525, 47725, 52465, 52675, 66524, 66525, 66665, 66674, 66675, 66725, 66765, 67426, 67574, 72426, 72475, 72576, 74475, 74476, 75674, 254275, 254475, 255475, 256266]

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

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