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A139054 as a simple table

na(n)
12
23
35
47
511
613
717
819
9101
10103
11107
12109
131009
141013
151019
161021
1710007
1810009
1910037
2010039
21100003
22100019
23100043
24100049
251000003
261000033
271000037
281000039
2910000019
3010000079
3110000103
3210000121
33100000007
34100000037
35100000039
36100000049

[2,3,5,7,11,13,17,19,101,103,107,109,1009,1013,
 1019,1021,10007,10009,10037,10039,100003,100019,
 100043,100049,1000003,1000033,1000037,1000039,
 10000019,10000079,10000103,10000121,100000007,
 100000037,100000039,100000049]