10000...00001 (181-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

                               1 0000000000 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000008 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000001

+ The only known tetradic prime of the form 100^n+8*10^n+1 containing a tetradic prime number of digits. [Honaker]

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