31638-69-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31638-69-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,6,3 and 8 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 31638-69:
(7*3)+(6*1)+(5*6)+(4*3)+(3*8)+(2*6)+(1*9)=114
114 % 10 = 4
So 31638-69-4 is a valid CAS Registry Number.