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A146663 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
139
149
1523
1623
1767
1867
19379
20379
212563
222563
2318843
2418843

[1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,67,67,379,379,
 2563,2563,18843,18843]