1259

This number is a prime.

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The largest concatenate emirp abcd from Ramanujan's classic paper that included a list of fifty-four quaternary (ax² + by² + cz² + du²) "diagonal" quadratic forms representing all integers. [Beedassy]

Submitted: 2014-12-27 14:16:37; Last Modified: 2020-06-23 16:01:09.