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A240971 as a simple table

na(n)
17
213
319
431
543
673
797
8103
9127
10157
11199
12223
13241
14271
15409
16421
17661
18673
19727
20859
21883
22937
231021
241039
251051
261063
271093
281447
291483
301609
311657
321669
331723
341753
351861
361879
371993
382029
392203
402437
412539
422677
432719
442803
452833
462953
473079
483121

[7,13,19,31,43,73,97,103,127,157,199,223,241,271,
 409,421,661,673,727,859,883,937,1021,1039,1051,
 1063,1093,1447,1483,1609,1657,1669,1723,1753,1861,
 1879,1993,2029,2203,2437,2539,2677,2719,2803,2833,
 2953,3079,3121]