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A242715 as a simple table

na(n)
13
23
33
43
57
611
719
831
973
1079
11131
12151
13271
14331
15631
16811
17937
181171
192731
203511
213511
226553
238191
2410531
2515121
2623311
2765521
2886113
2987211
30107251
31121369
32262657
33348031
34409891
35446473
361024921
371969111
384633201
397623851
4018837001
4122366891
4229121769

[3,3,3,3,7,11,19,31,73,79,131,151,271,331,631,811,
 937,1171,2731,3511,3511,6553,8191,10531,15121,
 23311,65521,86113,87211,107251,121369,262657,
 348031,409891,446473,1024921,1969111,4633201,
 7623851,18837001,22366891,29121769]