2377
This number is a prime.
2377 = 2&19 + 3&17 + 5&13 + 7&11 + 11&7 + 13&5 + 17&3 + 19&2, where the symbol &
means concatenation. The smallest prime of this form. [Poo Sung]
The prime square 2377^2 can itself be expressed as the sum of two squares (1495^2 + 1848^2). [Suzuki]
(There is one curio for this number that has not yet been approved by an editor.)
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