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A027723 as a simple table

n a(n)
1 7
2 9
3 313
4 999
5 31513
6 75357
7 78687
8 90909
9 98289
10 3159513
11 7642467
12 9009009
13 743080347
14 900090009
15 31413131413
16 90000900009
17 97474147479
18 3105075705013
19 9000009000009
20 757082131280757
21 900000090000009
22 907340818043709
23 90000000900000009
24 92269201110296229

[7,9,313,999,31513,75357,78687,90909,98289,
 3159513,7642467,9009009,743080347,900090009,
 31413131413,90000900009,97474147479,3105075705013,
 9000009000009,757082131280757,900000090000009,
 907340818043709,90000000900000009,
 92269201110296229]

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Last modified August 10 04:27 EDT 2022. Contains 356029 sequences. (Running on oeis4.)