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)A titanic prime which cannot become another prime by inserting another digit (nor appending a digit at the extremes). Found by Giovanni Resta. [Rivera]
Submitted: 2018-10-09 10:12:51; Last Modified: 2018-10-14 20:18:16.
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