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A280273 as a simple table

na(n)
13
25
323
441
559
6113
7131
8173
9179
10269
11281
12383
13401
14431
15443
16449
17461
18479
19521
20641
21653
22863
23929
24941
25953
261013
271103
281163
291301
301319
311361
321439
331481
341559
351583
361871
372003
382213
392309
402411
412609
422693
432711
442729
452801
462903
472909
482969
493041

[3,5,23,41,59,113,131,173,179,269,281,383,401,431,
 443,449,461,479,521,641,653,863,929,941,953,1013,
 1103,1163,1301,1319,1361,1439,1481,1559,1583,1871,
 2003,2213,2309,2411,2609,2693,2711,2729,2801,2903,
 2909,2969,3041]