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Reverse concatenation of the square of first a(n) integers gives a prime.

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`%I #16 Jan 16 2023 12:44:06
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`%S 2,3,14,700,2818
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`%N Reverse concatenation of the square of first a(n) integers gives a prime.
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`%C The number corresponding to a(5) = 2818 is a probable prime of 18269 digits. - _Giovanni Resta_, Jul 25 2013
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`%e a(4) = 700 because reverse concatenation of squares of 1 to 700 gives 490000488601......2516941 which is a 3742-digit prime number.
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`%Y Cf. A091314.
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`%K nonn,hard,more,base
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`%O 1,1
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`%A _Shyam Sunder Gupta_, Jul 22 2013
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`%E a(5) from _Giovanni Resta_, Jul 25 2013
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