31504-42-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31504-42-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,5,0 and 4 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 31504-42:
(7*3)+(6*1)+(5*5)+(4*0)+(3*4)+(2*4)+(1*2)=74
74 % 10 = 4
So 31504-42-4 is a valid CAS Registry Number.