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A281960 as a simple table

na(n)
161
279
3107
4139
5163
6191
7211
8263
9271
10373
11443
12617
13719
14733
15761
16971
17991
181097
191129
201231
211259
221373
231439
241531
251543
261597
271663
281697
291733
301753
311777
321831
332053
342081
352099
362137
372161
382213
392383
402423
412543
422677
432687
442719
452777
462843
472917

[61,79,107,139,163,191,211,263,271,373,443,617,
 719,733,761,971,991,1097,1129,1231,1259,1373,1439,
 1531,1543,1597,1663,1697,1733,1753,1777,1831,2053,
 2081,2099,2137,2161,2213,2383,2423,2543,2677,2687,
 2719,2777,2843,2917]