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A147281 as a simple table

na(n)
11
21
31
41
51
61
71
81
921
1049
1187
12289
131009
143425
1511605
1648481
17255569
181441107
198859577
2059249469
21422335799

[1,1,1,1,1,1,1,1,21,49,87,289,1009,3425,11605,
 48481,255569,1441107,8859577,59249469,422335799]