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f=lambda n,k=3:n%k^k/2>0<f(n,k+2)or k>n
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f=lambda n,k=3:n%k^1>0<f(n-1,k+2)or k>n
f=lambda n,k=3:~-n%k>0<f(n-1,k+2)or k>n
f=lambda n,k=3:n%k!=1==f(n-1,k+2)or k>n
