A344963 Numbers k such that (2*k+1)*k!+1 is prime.
0, 2, 3, 5, 11, 18, 68, 77, 124, 173, 205, 293, 1037, 1530, 1905, 2342, 3401, 4372, 4679, 5385
Offset: 1
Programs
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Maple
select(k -> isprime((2*k+1)*k!+1), [$0 .. 300])[];
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Mathematica
Do[If[PrimeQ[(2*k + 1)*Factorial[k] + 1], Print[k]], {k, 0, 3000}] -
PARI
for(k=0, 3000, if(isprime((2*k+1)*k!+1), print1(k", ")))
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SageMath
for k in range(3000): if is_prime((2*k+1)*factorial(k) + 1): print(k)
Comments