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A199165
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Numbers n such that (6^n-11)/5 is prime.
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1
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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, 840316
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(4) = 5 because (6^5-11)/5 = 1553 is prime.
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MATHEMATICA
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lst={}; Do[If[PrimeQ[(6^n-11)/5], Print[n]; AppendTo[lst, n]], {n, 10^6}]; lst
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PROG
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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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
a(31) corresponds to a probable prime discovered by Paul Bourdelais, Jun 18 2020
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STATUS
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approved
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