181811881

This number is a prime.

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Emirp formed by the concatenation in order of all three-digit primes containing 1 and 8. If we replace the 8s (2^3) with 2, 3, 2*3 and 3^2 it will yield 4 more primes. The same also works with 2*3*6*8*9. Curiously 1818118810188118181 is prime too. [Petrov]

Submitted: 2019-04-01 01:43:21;   Last Modified: 2019-04-05 09:58:50.
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