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A208293 as a simple table

na(n)
121
231
3109
4125
5135
6151
7161
8229
9281
10291
11359
12369
13385
14525
15541
16551
17619
18629
19645
20671
21681
22749
23759
24801
25879
26941
271009
281019
291035
301149
311165
321175
331399
341425
351435
361529
371539
381555
391565
401581
411669
421685
431695
441799
451851
461919
471945
481971

[21,31,109,125,135,151,161,229,281,291,359,369,
 385,525,541,551,619,629,645,671,681,749,759,801,
 879,941,1009,1019,1035,1149,1165,1175,1399,1425,
 1435,1529,1539,1555,1565,1581,1669,1685,1695,1799,
 1851,1919,1945,1971]