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A165696 a(n) is the smallest number m such that the n numbers A004086(m^k) (digit reversal of m^k) for 0 < k < n+1 are all primes. 2

%I #17 May 31 2022 16:28:53

%S 2,14,325,3244,3244,110218462,32149366346,10212002596432

%N a(n) is the smallest number m such that the n numbers A004086(m^k) (digit reversal of m^k) for 0 < k < n+1 are all primes.

%e Both numbers A004086(14) = 41 and A004086(14^2) = 691 are primes and 14 is the smallest number with this property so a(2) = 14.

%Y Cf. A004086, A118212, A118213, A165697, A165698, A165699.

%K nonn,base,hard,more

%O 1,1

%A _Farideh Firoozbakht_, Sep 29 2009

%E a(8) from _Matthias Baur_, Mar 03 2021

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Last modified August 29 08:53 EDT 2024. Contains 375511 sequences. (Running on oeis4.)