31

This number is a prime.

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31 is the first emirp to appear in the primeth sequence: P₁ = 2 ; P₂ = 3 ; P₃ = 5 ; P₅ = 11 ; P₁₁ = 31. The next emirp 9737333 occurs after 6 further steps and the third one is not below 10²⁵. [Beedassy]

Submitted: 2019-03-10 19:57:00; Last Modified: 2019-03-11 20:00:43.