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A078551 as a simple table

na(n)
25
35
47
513
65
75
817
913
1013
1161
127
1317
145
1513
1631
1729
1813
19181
2013
215
2261
2353
2417
2531
2617
2741
287
29421
3013
3137
3213
3361
3429
3513
3613
37137
38181
3917
4017
4129
425
4337
4461
4513
4653
4717
4831
4943
5031
5129
5217
53281
5441
5561
5617
57181
58421
591741
6013
611861
6237
6313
64127
6517
6661
67449
6829
6953

[5,5,7,13,5,5,17,13,13,61,7,17,5,13,31,29,13,181,
 13,5,61,53,17,31,17,41,7,421,13,37,13,61,29,13,13,
 137,181,17,17,29,5,37,61,13,53,17,31,43,31,29,17,
 281,41,61,17,181,421,1741,13,1861,37,13,127,17,61,
 449,29,53]