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A175637 as a simple table

n a(n)
1 1
2 3
3 7
4 9
5 11
6 77
7 111
8 707
9 777
10 909
11 1111
12 7777
13 11111
14 70707
15 77777
16 90909
17 111111
18 777777
19 1111111
20 7070707
21 7777777
22 9090909
23 11111111
24 77777777
25 111111111
26 707070707
27 777777777
28 909090909
29 1111111111
30 7777777777
31 11111111111

[1,3,7,9,11,77,111,707,777,909,1111,7777,11111,
 70707,77777,90909,111111,777777,1111111,7070707,
 7777777,9090909,11111111,77777777,111111111,
 707070707,777777777,909090909,1111111111,
 7777777777,11111111111]

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Last modified February 23 05:35 EST 2024. Contains 370267 sequences. (Running on oeis4.)