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A146176 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
1313
1413
1531
1631
1779
1879
19513
20513
214397
224397
2330071
2430071

[1,1,1,1,1,1,1,1,1,1,3,3,13,13,31,31,79,79,513,
 513,4397,4397,30071,30071]