4294945999
This number is a prime.
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4294945999 is the largest prime P < 2^32 such that SOD(P) = SOD(P^2); P^2 = 18446561134326108001. Challenge by Dale. [Rivera]
Submitted: 2019-04-04 19:26:53; Last Modified: 2019-04-07 02:13:21.
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