51739...71593 (509-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

+ A prime number obtained in the following way: around a central digit "0" append successively odd digits, 1-Right, 3-Left, 5-Right, 7-Left, 9-Right, 1-Left, and so on. [Rivera]

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