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A106972 as a simple table

na(n)
15
217
341
489
5101
6173
7257
8269
9293
10353
11461
12509
13521
14593
15677
16761
17773
18797
19857
20881
21929
22941
231013
241049
251097
261109
271181
281193
291217
301277
311301
321361
331433
341553
351601
361613
371637
381697
391721
401889
411949
421973
432141
442273
452309

[5,17,41,89,101,173,257,269,293,353,461,509,521,
 593,677,761,773,797,857,881,929,941,1013,1049,
 1097,1109,1181,1193,1217,1277,1301,1361,1433,1553,
 1601,1613,1637,1697,1721,1889,1949,1973,2141,2273,
 2309]