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A354881 as a simple table

na(n)
15
231
337
441
553
6103
7197
8263
9277
10337
11349
12353
13359
14373
15397
16401
17421
18431
19439
20547
21569
22587
23599
24857
25859
26863
27877
28883
29983
301009
311013
321039
331069
341091
351097
361103
371117
381129
391153
401171
411193
421213
431223
441237
451249
461279
471291
481301
491367
501811
511871
521931
531979
542647
552663

[5,31,37,41,53,103,197,263,277,337,349,353,359,
 373,397,401,421,431,439,547,569,587,599,857,859,
 863,877,883,983,1009,1013,1039,1069,1091,1097,
 1103,1117,1129,1153,1171,1193,1213,1223,1237,1249,
 1279,1291,1301,1367,1811,1871,1931,1979,2647,2663]