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A106973 as a simple table

na(n)
15
217
341
4257
5269
6293
7353
8509
9521
10677
11761
12797
13857
14881
15929
16941
171097
181109
191181
201217
211361
221433
231553
241613
251637
261721
271949
282141
292273
302357
312477
322609
332693
342777
352789
362861
372897
383041
393209
403449
413461
423533
433821

[5,17,41,257,269,293,353,509,521,677,761,797,857,
 881,929,941,1097,1109,1181,1217,1361,1433,1553,
 1613,1637,1721,1949,2141,2273,2357,2477,2609,2693,
 2777,2789,2861,2897,3041,3209,3449,3461,3533,3821]