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A374721 as a simple table

na(n)
11
23
37
421
557
6171
7495
81485
94401
1013203
1139447
12118341
13354537
141063611
153189375
169568125
1728700001
1886100003
19258286887
20774860661
212324542617
226973627851
2320920765455
2462762296365
25188286534801
26564859604403
271694577750327
285083733250981
2915251196564297
3045753589692891

[1,3,7,21,57,171,495,1485,4401,13203,39447,118341,
 354537,1063611,3189375,9568125,28700001,86100003,
 258286887,774860661,2324542617,6973627851,
 20920765455,62762296365,188286534801,564859604403,
 1694577750327,5083733250981,15251196564297,
 45753589692891]