1917-40-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1917-40-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,1 and 7 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1917-40:
(6*1)+(5*9)+(4*1)+(3*7)+(2*4)+(1*0)=84
84 % 10 = 4
So 1917-40-4 is a valid CAS Registry Number.