

A199165


Numbers n such that (6^n11)/5 is prime.


1



2, 3, 4, 5, 14, 19, 21, 50, 53, 136, 146, 1255, 1448, 1839, 2053, 2496, 4060, 5041, 8410, 14090, 14940, 19759, 29871, 44836, 78175, 114398, 120946, 137845, 461108, 727496
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..30.
Henri & Renaud Lifchitz, PRP Records.


EXAMPLE

a(4) = 5 because (6^511)/5 = 1553 is prime.


MATHEMATICA

lst={}; Do[If[PrimeQ[(6^n11)/5], Print[n]; AppendTo[lst, n]], {n, 10^6}]; lst


PROG

(PARI) is(n)=ispseudoprime((6^n11)/5) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A004062, A165210, A198725.
Sequence in context: A098552 A245447 A037340 * A202423 A171593 A227535
Adjacent sequences: A199162 A199163 A199164 * A199166 A199167 A199168


KEYWORD

nonn,more


AUTHOR

Gilbert Mozzo, Nov 03 2011


EXTENSIONS

a(23)a(28) are probable primes discovered by Paul Bourdelais, Nov 15 2011
a(23)a(28) independently confirmed as probable primes using Mathematica PrimeQ function by Gilbert Mozzo, Nov 21 2011
a(29) corresponds to a probable prime discovered by Paul Bourdelais, Apr 25 2019
a(30) corresponds to a probable prime discovered by Paul Bourdelais, Aug 12 2019


STATUS

approved



