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A001578 as a simple table

na(n)
11
21
32
43
55
61
713
87
917
1011
1189
121
13233
1429
1561
1647
171597
1819
1937
2041
21421
22199
2328657
2423
253001
26521
2753
28281
29514229
3031
31557
322207
3319801
343571
35141961
36107
3773
389349
39135721
402161
412789
42211
43433494437
4443
45109441
46139
472971215073
481103
4997
50101

[1,1,2,3,5,1,13,7,17,11,89,1,233,29,61,47,1597,19,
 37,41,421,199,28657,23,3001,521,53,281,514229,31,
 557,2207,19801,3571,141961,107,73,9349,135721,
 2161,2789,211,433494437,43,109441,139,2971215073,
 1103,97,101]