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A240680 as a simple table

na(n)
17
213
331
443
561
6103
7109
8199
9271
10367
11409
12421
13523
14541
15547
16787
17823
18829
19883
201009
211033
221117
231237
241291
251669
261999
272131
282161
292203
302269
312437
322503
332593
342671
352857
363049
373253
383271
393361
403559
413583
423769
433823
444003
454201
464339
474357

[7,13,31,43,61,103,109,199,271,367,409,421,523,
 541,547,787,823,829,883,1009,1033,1117,1237,1291,
 1669,1999,2131,2161,2203,2269,2437,2503,2593,2671,
 2857,3049,3253,3271,3361,3559,3583,3769,3823,4003,
 4201,4339,4357]