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A156553 as a simple table

na(n)
113
217
343
447
567
683
797
8127
9137
10157
11173
12433
13457
14653
15673
16677
17823
18827
19853
20857
21877
22937
23953
24977

[13,17,43,47,67,83,97,127,137,157,173,433,457,653,
 673,677,823,827,853,857,877,937,953,977]