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A244916
as a simple table
n
a(n)
1
3
2
31
3
71
4
97
5
107
6
277
7
307
8
641
9
907
10
967
11
1009
12
1447
13
3463
14
3527
15
7757
16
8167
17
250867
18
279047
[3,31,71,97,107,277,307,641,907,967,1009,1447, 3463,3527,7757,8167,250867,279047]