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A175505 as a simple table

na(n)
11
21
35
45
53
613
713
821
953
107
117
1249
1325
1429
1531
1685
1711
18109
1937
2027
2143
2215
2315
24193
2583
2653
27485
28113
2919
3059
3161
32341
3367
3423
3571
36433
3773
3877
3979
40107
4127
4283
4385
4459
45271
4631
4731
48769
49685
50167
51103
52209
5335
54973
5537
56449
57115
5839
5939
60239
61121
62125
63379
641365

[1,1,5,5,3,13,13,21,53,7,7,49,25,29,31,85,11,109,
 37,27,43,15,15,193,83,53,485,113,19,59,61,341,67,
 23,71,433,73,77,79,107,27,83,85,59,271,31,31,769,
 685,167,103,209,35,973,37,449,115,39,39,239,121,
 125,379,1365]