OFFSET
1,1
EXAMPLE
840 = 31^2-11^2 = 37^2-23^2 = 41^2-29^2 = 47^2-37^2 = 73^2-67^2 =
107^2-103^2
MATHEMATICA
Take[Transpose[Select[Tally[Sort[Last[#]-First[#]&/@(Subsets[ Prime[ Range[ 2000]], {2}]^2)]], Last[#]==6&]][[1]], 40] (* Harvey P. Dale, Nov 17 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Feb 22 2004
STATUS
approved