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A155339 as a simple table

na(n)
31
43
57
613
723
837
9183
101053
115351
1224397
1399215
14617661
155897471
1664288141
17714391583
187672307261
1995370104207
201561595349917
2131946273565055

[1,3,7,13,23,37,183,1053,5351,24397,99215,617661,
 5897471,64288141,714391583,7672307261,95370104207,
 1561595349917,31946273565055]