18181

This number is a prime.

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The only palindromic prime P that is the sum of the squares of the first n oban numbers, i.e., (3^2 + 5^2 + 6^2 +...+ 39^2 + 50^2), (case n=30). Curiously, sod(P) is the smallest invertible prime. [Bajpai]

Submitted: 2019-01-26 14:55:55;   Last Modified: 2019-01-26 15:57:33.
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