21023...18061 (45-digits)

This number is a prime.

                           21023 2043120369 2012919141 1891918461 1831318061

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The smallest prime P formed from the reverse concatenation of 9 consecutive a-pointer primes, i.e., {21023, 20431, 20369, 20129, 19141, 18919, 18461, 18313, 18061}. Curiously, P is also expressible as sum of two squares. [Bajpai]