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A180431
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Numbers n such that 4*17^n+1 is prime.
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1
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OFFSET
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1,2
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COMMENTS
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For n>0, members of the sequence may only be of form 4k+2 (otherwise the expression is divisible by 3 or 5). Therefore members of the sequence are a subset of A005574 and are Generalized Fermat primes.
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LINKS
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Table of n, a(n) for n=1..4.
Generalized Fermat number at MathWorld
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EXAMPLE
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For a(2) = 6 we have 4*17^6+1 = 96550277, which is prime.
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MATHEMATICA
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Do[ If[ PrimeQ[ 4*17^n+1], Print[ n ]], {n, 0, 10000}]
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PROG
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(PARI) is(n)=isprime(4*17^n+1) \\ Charles R Greathouse IV, May 15 2013
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CROSSREFS
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Sequence in context: A003395 A222607 A000411 * A202967 A230330 A252174
Adjacent sequences: A180428 A180429 A180430 * A180432 A180433 A180434
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KEYWORD
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more,nonn
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AUTHOR
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Serge Batalov, Sep 04 2010
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STATUS
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approved
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