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A138861 as a simple table

n a(n)
1 31
2 1021
3 1000000021
4 100000000000000021
5 10000000000000000000000000000000000000000000000000000021
6 100000000000000000000000000000000000000000000000000000000000000000000000000021 

[31,1021,1000000021,100000000000000021,
 10000000000000000000000000000000000000000000000000\
 000021,
 10000000000000000000000000000000000000000000000000\
 0000000000000000000000000021]

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Last modified April 18 11:52 EDT 2024. Contains 371779 sequences. (Running on oeis4.)