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A006055 as a simple table

n a(n)
1 2
2 3
3 5
4 7
5 23
6 67
7 89
8 4567
9 78901
10 678901
11 23456789
12 45678901
13 9012345678901
14 789012345678901
15 56789012345678901234567890123
16 90123456789012345678901234567
17 678901234567890123456789012345678901

[2,3,5,7,23,67,89,4567,78901,678901,23456789,
 45678901,9012345678901,789012345678901,
 56789012345678901234567890123,
 90123456789012345678901234567,
 678901234567890123456789012345678901]

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Last modified December 4 05:11 EST 2016. Contains 278748 sequences.