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A147399 as a simple table

na(n)
11
21
31
41
51
61
71
81
95
105
1117
1217
1345
1445
15217
16217
171729
181729
1928581
2028581
21422837
22422837
237769557
247769557
25212491441
26212491441

[1,1,1,1,1,1,1,1,5,5,17,17,45,45,217,217,1729,
 1729,28581,28581,422837,422837,7769557,7769557,
 212491441,212491441]