This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).
Single Curio View: (Seek other curios for this number)The largest known prime-digit prime at the time: 72323252323272325252*(10^3120-1)/(10^20-1)+1. It was discovered by Harvey Dubner in 1992.
Submitted: 2018-04-01 11:57:32; Last Modified: 2018-04-01 12:01:32.
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