5111111111111119

This number is a prime.

511111 1111111119

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The smallest prime formed by inserting between two different digits a, b, (a+b) 1's, i.e., (a=5, b=9). Shall we call it an “almost near-repunit prime”? [Loungrides]

Submitted: 2018-10-08 09:46:57; Last Modified: 2019-01-20 15:55:50.