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A147253 as a simple table

na(n)
11
21
31
41
51
61
71
81
911
1017
1141
1257
13231
14453
151543
163457
1718427
1850015
19289401
20862907
215771143
2220904685
23158696163
24662519097

[1,1,1,1,1,1,1,1,11,17,41,57,231,453,1543,3457,
 18427,50015,289401,862907,5771143,20904685,
 158696163,662519097]