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n=>8*(x=((int)Math.Sqrt(--n)+1)/2+1>>1)*x+(n<4*x*x+2*x?-2:6)*x+1-n;int x;
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n=>8*(x=((int)Math.Sqrt(--n)+1)/2)*x+(n<4*x*x+2*x?-2:6)*x+1-n;int x;
Try it online!
n=>8*(x=(int)Math.Sqrt(--n)+1>>1)*x+(n<4*x*x+2*x?-2:6)*x+1-n;int x;
