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A168568 as a simple table

na(n)
15
253
33329
44583
57691
612611
714957
817609
920249
1035081
1156501
1271663
13134909
14191231
15237851
16305477
17339539
18351293
19394007
20418997
21432569
22466079
23574109
24611993
25619841
26628373
27659831
28701741
29709469
30744251
31752903
321386977
331398779

[5,53,3329,4583,7691,12611,14957,17609,20249,
 35081,56501,71663,134909,191231,237851,305477,
 339539,351293,394007,418997,432569,466079,574109,
 611993,619841,628373,659831,701741,709469,744251,
 752903,1386977,1398779]