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(f!g)n=sum$n=sum[f i*g(*).f.div n<*>g<$>[i|i<n i)|i<-[1..n],mod n i<1]
Try it online!Try it online!
Thanks to flawr for -6 bytes and a great challenge! And thanks to H.PWiz for another -6!
(f!g)n=sum$(*).f.div n<*>g<$>[i|i<-[1..n],mod n i<1]
Try it online!
Thanks to flawr for -6 bytes and a great challenge!
(f!g)n=sum[f i*g(div n i)|i<-[1..n],mod n i<1]
(f!g= \n->sum$map((g)n=sum$(*).f.div n)<*>g)[i|i<n<*>g<$>[i|i<-[1..n],mod n i<1]
f!g= \n->sum$map(((*).f.div n)<*>g)[i|i<-[1..n],mod n i<1]
