login

A002972 as a simple table

na(n)
11
23
31
45
51
65
77
85
93
105
119
121
133
147
1511
167
1711
1813
199
207
211
2215
2313
2415
251
2613
279
285
2917
3013
3111
329
335
3417
357
3617
3719
381
393
4015
4117
427
4321
4419
455
4611
4721
4819
4913
501
5123
525
5317
5419
5525
5613
5725
5823
591
605
6115
6227
639
6419
6525
6617
6711
685
6925
7027
7123
7229
7329
7425
7523
7619
7729
7813
7931
8031

[1,3,1,5,1,5,7,5,3,5,9,1,3,7,11,7,11,13,9,7,1,15,
 13,15,1,13,9,5,17,13,11,9,5,17,7,17,19,1,3,15,17,
 7,21,19,5,11,21,19,13,1,23,5,17,19,25,13,25,23,1,
 5,15,27,9,19,25,17,11,5,25,27,23,29,29,25,23,19,
 29,13,31,31]