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A308732 as a simple table

na(n)
17
223
347
471
573
679
7103
8151
9167
10191
11199
12239
13263
14271
15311
16337
17359
18367
19383
20439
21463
22479
23487
24503
25599
26607
27631
28647
29719
30727
31743
32751
33823
34839
35863
36887
37919
38937
39967
40983
41991
421031
431039
441063
451087
461151
471223
481231
491279
501289
511303

[7,23,47,71,73,79,103,151,167,191,199,239,263,271,
 311,337,359,367,383,439,463,479,487,503,599,607,
 631,647,719,727,743,751,823,839,863,887,919,937,
 967,983,991,1031,1039,1063,1087,1151,1223,1231,
 1279,1289,1303]