OFFSET
1,7
COMMENTS
I am attempting to complete a proof that for every natural number n, there is at least one prime of the form n^2+k^2 or (n^2+k^2)/2 with 1<=k<=n.
EXAMPLE
a(3)=1 because (3^2+1)/2=5 (prime)
a(7)=2 ------> 7^2+2^2=53 (prime)
a(12)=7 -----> 12^2+7^2=193 (prime)
a(23)=3 -----> (23^2+3^2)/2=269 (prime)
a(48)=13 ----> 48^2+13^2=2473 (prime)
CROSSREFS
KEYWORD
nonn
AUTHOR
Robin Garcia, Jun 20 2005
STATUS
approved