9999999900000001
This number is a prime.
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9999999900000001 = 10^8+99999999^2, 999999000001 = 10^6+999999^2, 99990001 = 10^4+9999^2, 9901 = 10^2+99^2 are the unique expressions (as sums of squares) of four primes. Very likely theses are the only primes of this form. [Kuhn]
Submitted: 2013-03-03 07:43:13; Last Modified: 2023-09-23 15:38:17.
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