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A308816 as a simple table

na(n)
17
217
323
431
541
647
771
8103
9113
10151
11167
12191
13239
14263
15271
16281
17311
18353
19359
20383
21431
22479
23503
24521
25599
26647
27719
28743
29823
30839
31863
32887
33911
34953
35983
361031
371103
381151
391223
401319
411361
421367
431439
441487
451511
461559
471583
481607
491663
501823
511831
521847
531871
542039
552063
562087
572111

[7,17,23,31,41,47,71,103,113,151,167,191,239,263,
 271,281,311,353,359,383,431,479,503,521,599,647,
 719,743,823,839,863,887,911,953,983,1031,1103,
 1151,1223,1319,1361,1367,1439,1487,1511,1559,1583,
 1607,1663,1823,1831,1847,1871,2039,2063,2087,2111]