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A176284 as a simple table

na(n)
01
11
21
31
47
51
61
719
819
91
101
1137
1249
1337
141
151
1661
1791
1891
1961
201
211
2291
23145
24163
25145
2691
271
281
29127
30211
31253
32253
33211
34127
351
361
37169
38289
39361
40385
41361
42289
43169
441
451
46217
47379
48487
49541
50541
51487
52379
53217
541
551
56271
57481
58631
59721
60751
61721
62631
63481
64271
651

[1,1,1,1,7,1,1,19,19,1,1,37,49,37,1,1,61,91,91,61,
 1,1,91,145,163,145,91,1,1,127,211,253,253,211,127,
 1,1,169,289,361,385,361,289,169,1,1,217,379,487,
 541,541,487,379,217,1,1,271,481,631,721,751,721,
 631,481,271,1]