Dear Seqfans, I'm looking for one (or more) parametric 3 integer functions such that GCD[f1,f2,f3]=1 for every value of parameter Example of these is e.g. : GCD[Prime[x]^2+(Prime[x]-1)^2, Prime[x]^2-(Prime[x]-1)^2, 2 Prime[x]^2 (Prime[x]-1)]=1 I'm looking for another. If sombody know these let me know! Best wishes Artur