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Numbers n such that Fibonacci(n) concatenated with its 10's complement is prime.
1

%I #5 Dec 15 2017 17:36:22

%S 1,2,4,8,14,16,31,41,58,83,194,238,251,938,998,1244,2273,2291

%N Numbers n such that Fibonacci(n) concatenated with its 10's complement is prime.

%C Larger values not certified prime.

%e a(7)=31 because Fibonacci(31)=1346269; 10000000-1346269 = 8653731,

%e and 13462698653731 is prime.

%Y Cf. A084620.

%K base,more,nonn

%O 1,2

%A _Jason Earls_, Jun 01 2003