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A248546 Numbers n such that 75^n-2 is prime. 0


%S 1,2,25,32,62,128,848,2091,2882

%N Numbers n such that 75^n-2 is prime.

%C Dedicated to N. J. A. Sloane for his 75th birthday!

%C Next term, if it exists, is greater than 10000.

%t Select[Range[1000],PrimeQ[75^#-2]&]

%o (MAGMA) [n: n in [0..200] | IsPrime(75^n-2)]; // _Vincenzo Librandi_, Oct 08 2014

%o (PARI) is(n)=ispseudoprime(75^n-2) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A014224, A109080, A090669, A128455, A128457, A128458, A128459, A128460.

%K nonn,more

%O 1,2

%A _Vaclav Kotesovec_, Oct 08 2014

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Last modified January 27 17:58 EST 2020. Contains 331296 sequences. (Running on oeis4.)