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A106955 as a simple table

na(n)
15
27
317
443
561
6131
7137
8149
9199
10233
11239
12251
13311
14359
15389
16397
17443
18463
19467
20499
21557
22577
23587
24617
25643
26647
27653
28691
29739
30761
31769
32809
33823
34859
35937
36997
371069
381109
391163
401277
411279
421289
431373
441423
451429
461453
471489
481559
491613

[5,7,17,43,61,131,137,149,199,233,239,251,311,359,
 389,397,443,463,467,499,557,577,587,617,643,647,
 653,691,739,761,769,809,823,859,937,997,1069,1109,
 1163,1277,1279,1289,1373,1423,1429,1453,1489,1559,
 1613]