41

This number is a prime.

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The sixth prime digit sum of the contiguously concatenated digits of the Copeland-Erdös Constant, (i.e. 0.2357111317192 ...) has SOD(235711131719) = 41, and is the smallest such sum to have an adjacent sum of digits similarly formed, i.e. SOD(2357111317192) = 43, which is only a single-digit longer. Note that {41,43} are twin primes. [Harrison]

Submitted: 2020-02-03 14:43:17;   Last Modified: 2020-02-03 16:05:44.
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