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A247672 as a simple table

na(n)
16
22
32
423
53
61
73
81033
92
106449
1115887
121
13100169
14268393
15636917
162113589
1770324093
181
1927852457
2078848479
212
22468329417
234
241
2510220118551

[6,2,2,23,3,1,3,1033,2,6449,15887,1,100169,268393,
 636917,2113589,70324093,1,27852457,78848479,2,
 468329417,4,1,10220118551]