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A187220 as a simple table

na(n)
00
11
23
37
415
523
631
747
871
987
1095
11111
12135
13159
14191
15247
16311
17343
18351
19367
20391
21415
22447
23503
24567
25607
26639
27695
28767
29847
30967
311143
321303
331367
341375
351391
361415
371439
381471
391527
401591
411631
421663
431719
441791
451871
461991
472167
482327
492399
502431

[0,1,3,7,15,23,31,47,71,87,95,111,135,159,191,247,
 311,343,351,367,391,415,447,503,567,607,639,695,
 767,847,967,1143,1303,1367,1375,1391,1415,1439,
 1471,1527,1591,1631,1663,1719,1791,1871,1991,2167,
 2327,2399,2431]