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A272981 as a simple table

n a(n)
1 3
2 7
3 7
4 31
5 31
6 211
7 211
8 211
9 211
10 2311
11 2311
12 120121
13 120121
14 120121
15 120121
16 4084081
17 4084081
18 106696591
19 106696591
20 106696591
21 106696591
22 892371481
23 892371481
24 892371481
25 892371481
26 892371481
27 892371481
28 71166625531
29 71166625531
30 200560490131
31 200560490131

[3,7,7,31,31,211,211,211,211,2311,2311,120121,
 120121,120121,120121,4084081,4084081,106696591,
 106696591,106696591,106696591,892371481,892371481,
 892371481,892371481,892371481,892371481,
 71166625531,71166625531,200560490131,200560490131]

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Last modified July 29 05:59 EDT 2021. Contains 346340 sequences. (Running on oeis4.)