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edited Nov 3, 2022 at 20:45

Go, 7675 bytes

func f(n int)int{if n<10{return n}
k:=0
for;n>0;n/=10{k+=n%10}
return f(k)
 }

func(n int)int{return^-n%9+1}

func(n int)int{return^-n%9+1}

func f(n int)int{if n<10{return n}
k:=0
for;n>0;n/=10{k+=n%10}
return f(k)
 }

func(n int)int{return^-n%9+1}

func f(n int)int{if n<10{return n}
k:=0
for;n>0;n/=10{k+=n%10}
return f(k)}

func(n int)int{return^-n%9+1}

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created Nov 3, 2022 at 19:07

func f(n int)int{if n<10{return n}
k:=0
for;n>0;n/=10{k+=n%10}
return f(k)
}

func(n int)int{return^-n%9+1}