OFFSET
1,1
COMMENTS
If x or y = 1, we obtain primes of the form x^2 + 1 (or y^2 + 1) corresponding to the sequence A002496(n). The first value of this sequence, a(1) = 10657, is not of the form x^2 + 1.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..50
EXAMPLE
10657 is in the sequence because if (x,y) = (3,4), then 3^(2*4) + 4^(2*3) = 6561 + 4096 = 10657.
MATHEMATICA
a={}; Do[Do[k=x^(2*y)+y^(2*x); If[PrimeQ[k], AppendTo[a, k]], {x, 2, y}], {y, 2, 200}]; Union[a]
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Feb 16 2012
STATUS
approved