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A115644 as a simple table

na(n)
16
29
325
4121
5841
6871
75041
85767
9363721
10368761
11409111
123633841
133992431
143992551
154032121
164037791
1739962281
1839962311
1939963031
2040279711
2140279801
2243585921
2343591687
2443909207
25479047801
26479365321
27479370271
28482631271

[6,9,25,121,841,871,5041,5767,363721,368761,
 409111,3633841,3992431,3992551,4032121,4037791,
 39962281,39962311,39963031,40279711,40279801,
 43585921,43591687,43909207,479047801,479365321,
 479370271,482631271]