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%I #20 Apr 25 2020 03:55:36
%S 0,4,8,524,972,3780,7704
%N Numbers k such that 5^(k+3) + 3^(k+2) + 2^(k+1) + 1 is prime.
%C Larger k values yield probable primes.
%C a(8) > 50000 (if it exists).
%t ParallelTable[If[PrimeQ[5^(n+3) + 3^(n+2) + 2^(n+1) + 1], n, Nothing], {n, 0, 10^4}]
%Y Cf. A306573.
%K nonn,hard,more
%O 1,2
%A _Mikk Heidemaa_, Jun 07 2019
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