31639-29-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31639-29-9 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 9 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 31639-29:
(7*3)+(6*1)+(5*6)+(4*3)+(3*9)+(2*2)+(1*9)=109
109 % 10 = 9
So 31639-29-9 is a valid CAS Registry Number.