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A087511 as a simple table

n a(n)
1 13
2 31
3 11313331
4 11333131
5 13111333
6 13131133
7 13131331
8 13133311
9 13311313
10 31133131
11 33113131
12 1113131333
13 1131131333
14 1131311333
15 1131331133
16 1133111333
17 1133113133
18 1133133311
19 1133311313
20 1133313113
21 1133313131

[13,31,11313331,11333131,13111333,13131133,
 13131331,13133311,13311313,31133131,33113131,
 1113131333,1131131333,1131311333,1131331133,
 1133111333,1133113133,1133133311,1133311313,
 1133313113,1133313131]

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Last modified May 27 02:41 EDT 2024. Contains 372847 sequences. (Running on oeis4.)