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A019546 as a simple table

na(n)
12
23
35
47
523
637
753
873
9223
10227
11233
12257
13277
14337
15353
16373
17523
18557
19577
20727
21733
22757
23773
242237
252273
262333
272357
282377
292557
302753
312777
323253
333257
343323
353373
363527
373533
383557
393727
403733
415227
425233
435237
445273
455323
465333
475527
485557

[2,3,5,7,23,37,53,73,223,227,233,257,277,337,353,
 373,523,557,577,727,733,757,773,2237,2273,2333,
 2357,2377,2557,2753,2777,3253,3257,3323,3373,3527,
 3533,3557,3727,3733,5227,5233,5237,5273,5323,5333,
 5527,5557]