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A160031 as a simple table

na(n)
15
213
319
443
571
683
797
8101
9107
10109
11127
12149
13179
14193
15197
16211
17233
18241
19311
20353
21383
22401
23421
24541
25577
26599
27607
28619
29641
30647
31683
32709
33727
34751
35769
36827
37877
38883
39941
40967
41991
421009
431061
441097
451109
461187
471289
481373
491381
501409
511439

[5,13,19,43,71,83,97,101,107,109,127,149,179,193,
 197,211,233,241,311,353,383,401,421,541,577,599,
 607,619,641,647,683,709,727,751,769,827,877,883,
 941,967,991,1009,1061,1097,1109,1187,1289,1373,
 1381,1409,1439]