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A290471 as a simple table

na(n)
21
35
47
517
631
752
899
9169
10301
11536
12947
131698
143043
155482
169919
1717993
1832743
1959713
20109099
21199634
22365719
23670605
241230547
252259286
264149841
277624904
2814013499
2925759764
3047358741
3187077529
32160120891
33294453673
34541509775
35995888884
361831584239

[1,5,7,17,31,52,99,169,301,536,947,1698,3043,5482,
 9919,17993,32743,59713,109099,199634,365719,
 670605,1230547,2259286,4149841,7624904,14013499,
 25759764,47358741,87077529,160120891,294453673,
 541509775,995888884,1831584239]