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.

A143967 Numbers containing only digits 3 or 7 in decimal representation.

Table of values

n a(n)
1 3
2 7
3 33
4 37
5 73
6 77
7 333
8 337
9 373
10 377
11 733
12 737
13 773
14 777
15 3333
16 3337
17 3373
18 3377
19 3733
20 3737
21 3773
22 3777
23 7333
24 7337
25 7373
26 7377
27 7733
28 7737
29 7773
30 7777
31 33333
32 33337
33 33373
34 33377
35 33733
36 33737
37 33773
38 33777
39 37333
40 37337
41 37373
42 37377

List of values

[3, 7, 33, 37, 73, 77, 333, 337, 373, 377, 733, 737, 773, 777, 3333, 3337, 3373, 3377, 3733, 3737, 3773, 3777, 7333, 7337, 7373, 7377, 7733, 7737, 7773, 7777, 33333, 33337, 33373, 33377, 33733, 33737, 33773, 33777, 37333, 37337, 37373, 37377]

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

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