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A198725
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Primes of the form (6^n-11)/5.
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1
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OFFSET
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1,1
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COMMENTS
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These primes are also given by sum 6^k -1 with k>0 and are then companions of A165210 which corresponds also to sum 6^k +1 with k>0. (Be careful: there is a shifting between the k and the n values).
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LINKS
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EXAMPLE
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(6^4-11)/5=257, which is in the sequence because is prime.
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MATHEMATICA
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lst={}; Do[If[PrimeQ[(6^n-11)/5], Print[(6^n-11)/5]; AppendTo[lst, (6^n-11)/5]], {n, 10^6}];
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PROG
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(Magma) [(6^n-11)/5: n in [1..10^3] | IsPrime((6^n-11) div 5)];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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