4138-31-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 4138-31-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,1,3 and 8 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 4138-31:
(6*4)+(5*1)+(4*3)+(3*8)+(2*3)+(1*1)=72
72 % 10 = 2
So 4138-31-2 is a valid CAS Registry Number.