OFFSET
1,2
COMMENTS
Corresponding primes of the form (2n^2)^8 + 1 are {257, 11763130845074473217, 47330370277129322497, 557556054479199010817, 167772160000000000000001, ...}.
There are consecutive twin pairs {a(n),a(n+1)} = {11,12}, {29,30}, {263,264},{285,286}, {492,493}, {833,834}, ...
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..5000
MATHEMATICA
Select[Range[1000], PrimeQ[(2*#1^2)^8+1]&]
Select[Range[1000], PrimeQ[256#^16+1]&] (* Harvey P. Dale, Nov 04 2020 *)
PROG
(PARI) is(n)=isprime((2*n^2)^8+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alexander Adamchuk, Sep 10 2006
STATUS
approved