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A338121 as a simple table

na(n)
11
22
33
44
55
67
731
843
967
1079
1185
1287
13103
14115
15475
16643
171015
181399
191495
201723
211819
221939
231987

[1,2,3,4,5,7,31,43,67,79,85,87,103,115,475,643,
 1015,1399,1495,1723,1819,1939,1987]