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A147273 as a simple table

na(n)
11
21
31
41
51
61
71
81
921
1041
1179
12171
13645
141743
155843
1617953
1798853
18402491
192708743
2012396159

[1,1,1,1,1,1,1,1,21,41,79,171,645,1743,5843,17953,
 98853,402491,2708743,12396159]