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

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The only known tetradic prime of the form 100^n+8*10^n+1 containing a tetradic prime number of digits. Here, n = 90. [Honaker]

Submitted: 2020-07-25 21:50:13; Last Modified: 2023-10-15 03:28:21.