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A020459 as a simple table

n a(n)
1 2
2 7
3 227
4 277
5 727
6 2777
7 7727
8 22277
9 22727
10 22777
11 27277
12 72227
13 72277
14 72727
15 272227
16 272777
17 727777
18 777277
19 2227727
20 2227777
21 2272727
22 2277727
23 2727727
24 2772227
25 7272227
26 7722277
27 7727777
28 7772777
29 7777727
30 22227277
31 22272277

[2,7,227,277,727,2777,7727,22277,22727,22777,
 27277,72227,72277,72727,272227,272777,727777,
 777277,2227727,2227777,2272727,2277727,2727727,
 2772227,7272227,7722277,7727777,7772777,7777727,
 22227277,22272277]

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Last modified August 15 13:27 EDT 2020. Contains 336504 sequences. (Running on oeis4.)