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A002278 as a simple table

n a(n)
0 0
1 4
2 44
3 444
4 4444
5 44444
6 444444
7 4444444
8 44444444
9 444444444
10 4444444444
11 44444444444
12 444444444444
13 4444444444444
14 44444444444444
15 444444444444444
16 4444444444444444
17 44444444444444444
18 444444444444444444
19 4444444444444444444
20 44444444444444444444
21 444444444444444444444

[0,4,44,444,4444,44444,444444,4444444,44444444,
 444444444,4444444444,44444444444,444444444444,
 4444444444444,44444444444444,444444444444444,
 4444444444444444,44444444444444444,
 444444444444444444,4444444444444444444,
 44444444444444444444,444444444444444444444]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)