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A178491 as a simple table

na(n)
17
217
331
453
597
6127
7241
8337
9577
101249
113361
123697
134373
144801
156961
168191
1710657
1813121
1923761
2025537
2131249
2232257
2333613
2437537
2549297
2659581
2764081
2865521
2977617
3079201
3189041
32126001
33131071
34138337
35153457
36159013
37171697
38193441

[7,17,31,53,97,127,241,337,577,1249,3361,3697,
 4373,4801,6961,8191,10657,13121,23761,25537,31249,
 32257,33613,37537,49297,59581,64081,65521,77617,
 79201,89041,126001,131071,138337,153457,159013,
 171697,193441]