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A275368 Numbers k such that A000032(k) + 2^k is a prime. 1

%I #20 Jan 16 2023 21:40:59

%S 0,1,2,4,5,7,13,22,52,53,85,175,214,223,556,631

%N Numbers k such that A000032(k) + 2^k is a prime.

%C Next term > 10^5. - _Joerg Arndt_, Jul 25 2016

%t Select[Range[0, 7000], PrimeQ[LucasL[#] + 2^#] &]

%o (Magma) [n: n in [1..7000] | IsPrime(Lucas(n)+2^n)];

%o (PARI) isok(n) = isprime(fibonacci(n-1)+fibonacci(n+1)+2^n); \\ _Altug Alkan_, Jul 25 2016

%Y Cf. A000032, A088859.

%K nonn,more

%O 1,3

%A _Vincenzo Librandi_, Jul 25 2016

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)