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A253249 as a simple table

na(n)
11
23
33
47
53
611
73
815
97
1011
113
1231
133
1411
1511
1631
173
1831
193
2031
2111
2211
233
2479
257
2611
2715
2831
293
3051
313
3263
3311
3411
3511
36103
373
3811
3911
4079
413
4251
433
4431
4531
4611
473
48191
497
5031
5111
5231
533
5479
5511
5679
5711
5811
593
60175
613
6211
6331
64127
6511
6651
673
6831
6911
7051

[1,3,3,7,3,11,3,15,7,11,3,31,3,11,11,31,3,31,3,31,
 11,11,3,79,7,11,15,31,3,51,3,63,11,11,11,103,3,11,
 11,79,3,51,3,31,31,11,3,191,7,31,11,31,3,79,11,79,
 11,11,3,175,3,11,31,127,11,51,3,31,11,51]