OFFSET
1,1
LINKS
Ray Chandler, Table of n, a(n) for n = 1..10000
MATHEMATICA
Take[Transpose[Select[Tally[Transpose[Union[Sort/@({Times@@#, (Last[#]^2- First[#]^2)/2}&/@(Select[Subsets[Range[1, 501, 2], {2}], GCD@@#==1&]))]][[1]]], OddQ[#[[1]]]&&#[[2]]>1&]][[1]], 60] (* Harvey P. Dale, May 28 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Lekraj Beedassy, Jun 18 2003
EXTENSIONS
Corrected and extended by Ray Chandler, Oct 29 2003
STATUS
approved