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A147502 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
133
143
159
169
1719
1819
1937
2037
21159
22159
23849
24849
254243
264243

[1,1,1,1,1,1,1,1,1,1,1,1,3,3,9,9,19,19,37,37,159,
 159,849,849,4243,4243]