

A180431


Numbers n such that 4*17^n+1 is prime.


1




OFFSET

1,2


COMMENTS

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.


LINKS



EXAMPLE

For a(2) = 6 we have 4*17^6+1 = 96550277, which is prime.


MATHEMATICA

Do[ If[ PrimeQ[ 4*17^n+1], Print[ n ]], {n, 0, 10000}]


PROG



CROSSREFS



KEYWORD

nonn,more


AUTHOR



STATUS

approved



