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A175221 as a simple table

na(n)
16
27
39
411
515
617
721
823
927
1033
1135
1241
1345
1447
1551
1657
1763
1865
1971
2075
2177
2283
2387
2493
25101
26105
27107
28111
29113
30117
31131
32135
33141
34143
35153
36155
37161
38167
39171
40177
41183
42185
43195
44197
45201
46203
47215
48227
49231
50233
51237
52243
53245
54255
55261
56267
57273
58275

[6,7,9,11,15,17,21,23,27,33,35,41,45,47,51,57,63,
 65,71,75,77,83,87,93,101,105,107,111,113,117,131,
 135,141,143,153,155,161,167,171,177,183,185,195,
 197,201,203,215,227,231,233,237,243,245,255,261,
 267,273,275]