31503-18-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31503-18-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,5,0 and 3 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 31503-18:
(7*3)+(6*1)+(5*5)+(4*0)+(3*3)+(2*1)+(1*8)=71
71 % 10 = 1
So 31503-18-1 is a valid CAS Registry Number.