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a->[if(x<2,-1,(d=divisorsx/divisors(x))[#d-1][2])|x<-a]
Try it online!Try it online!
a->[if(x<2,-1,(d=divisors(x))[#d-1])|x<-a]
Try it online!
a->[if(x<2,-1,x/divisors(x)[2])|x<-a]
