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A102421 as a simple table

na(n)
01
17
21
31
45
525
67
717
819
943
101
1113
127
1361
141
1535
1637
1779
185
1911
2023
2197
2225
2353
2455
25115
267
2731
281
29133
3017
3171
3273
33151
3419
355
3641
37169
3843
3989
4091
41187
421
4349
4425
45205
4613
47107
48109
49223
507
5129
5259
53241
5461
55125
56127
57259
581
5967
6017
61277
6235
63143
64145
65295
6637
6719
6877
69313

[1,7,1,1,5,25,7,17,19,43,1,13,7,61,1,35,37,79,5,
 11,23,97,25,53,55,115,7,31,1,133,17,71,73,151,19,
 5,41,169,43,89,91,187,1,49,25,205,13,107,109,223,
 7,29,59,241,61,125,127,259,1,67,17,277,35,143,145,
 295,37,19,77,313]