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A368340 as a simple table

na(n)
13
21
35
417
519
67
715
81
917
109
11197
1249
1351
14127
1511
16577
1735
181
1937
20721
2113
22199
2324335
2497
2599
26649
27485
2815
2919603
3031
3163
321
3365
3433
35251
3617
373699
3857799
3953
40161
41163
4255
4310405
4477617
4519
461151
472143295
484801
4999
501
51101
525201
5332080051
541351
5521
56127

[3,1,5,17,19,7,15,1,17,9,197,49,51,127,11,577,35,
 1,37,721,13,199,24335,97,99,649,485,15,19603,31,
 63,1,65,33,251,17,3699,57799,53,161,163,55,10405,
 77617,19,1151,2143295,4801,99,1,101,5201,32080051,
 1351,21,127]