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A006203
as a simple table
n
a(n)
1
23
2
31
3
59
4
83
5
107
6
139
7
211
8
283
9
307
10
331
11
379
12
499
13
547
14
643
15
883
16
907
[23,31,59,83,107,139,211,283,307,331,379,499,547, 643,883,907]