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A218372 as a simple table

na(n)
11
23
33
47
515
67
715
863
963
1015
1129
12253
13509
14253
1529
1657
171009
184081
194081
201009
2157
22113
234033
2432641
2565409
2632641
274033
28113
29225
3016129
31261121
321046529
331046529
34261121
3516129
36225
37449
3864511
392088955
4016744435
4133488029
4216744435
432088955

[1,3,3,7,15,7,15,63,63,15,29,253,509,253,29,57,
 1009,4081,4081,1009,57,113,4033,32641,65409,32641,
 4033,113,225,16129,261121,1046529,1046529,261121,
 16129,225,449,64511,2088955,16744435,33488029,
 16744435,2088955]