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A057911 Numbers k such that 2*3^k + 5 is prime. 1

%I

%S 0,1,2,3,4,5,8,9,22,23,28,37,49,53,59,74,83,149,183,577,993,1335,1777,

%T 7077,8518,8775,12193,20225

%N Numbers k such that 2*3^k + 5 is prime.

%C a(29) > 20270. - _Jinyuan Wang_, Jan 20 2020

%t Do[ If[ PrimeQ[ 2*3^n + 5 ], Print[ n ] ], {n, 0, 2500} ]

%o (PARI) is(n)=ispseudoprime(2*3^n+5) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A057910 (2*3^k - 5 is prime).

%K nonn,more

%O 1,3

%A _Robert G. Wilson v_, Nov 16 2000

%E First term 0 inserted by _Georg Fischer_, Aug 01 2019

%E a(24)-a(28) from _Jinyuan Wang_, Jan 20 2020

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Last modified July 28 05:31 EDT 2021. Contains 346317 sequences. (Running on oeis4.)