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A183971 as a simple table

na(n)
181
2459
3459
42601
54401
62601
715759
843163
943163
1015759
1195481
12459821
13746017
14459821
1595481
16586791
174911675
1814219749
1914219749
204911675
21586791
223606201
2353575889
24272110811
25492135291
26272110811
2753575889
283606201
2922235391

[81,459,459,2601,4401,2601,15759,43163,43163,
 15759,95481,459821,746017,459821,95481,586791,
 4911675,14219749,14219749,4911675,586791,3606201,
 53575889,272110811,492135291,272110811,53575889,
 3606201,22235391]