1020-17-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1020-17-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,0,2 and 0 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1020-17:
(6*1)+(5*0)+(4*2)+(3*0)+(2*1)+(1*7)=23
23 % 10 = 3
So 1020-17-3 is a valid CAS Registry Number.