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A118724 as a simple table

na(n)
12
23
35
47
513
617
731
837
953
1071
11113
12131
13137
14157
15211
16311
17317
18359
19389
20431
21557
22571
23751
24827
25839
26953
27983
281117
291151
301297
311367
321511
331553
341621
351637
361759
372111
382179
392213
402269
412339
422393
432699
442719
452969
462971
473167
483221
493329
503511

[2,3,5,7,13,17,31,37,53,71,113,131,137,157,211,
 311,317,359,389,431,557,571,751,827,839,953,983,
 1117,1151,1297,1367,1511,1553,1621,1637,1759,2111,
 2179,2213,2269,2339,2393,2699,2719,2969,2971,3167,
 3221,3329,3511]