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<p>[QUOTE=&quot;calcol, post: 26414244, member: 77639&quot;]Checked my new customer number again. It’s 9, not 8, digits. That allows PCGS to have 9 billion customers if they want to avoid leading zeros. Enough for everyone on the planet! Avoiding leading zeros is a good idea. They can be handled in house by businesses reasonably well, but customers are a different matter. Most businesses avoid leading zeros. I’ve had many bank and credit card numbers over the years. None started with a zero. My wife once had a time share. Customer number was 12 digits with 5 (or was it 6) leading zeros. Had to count carefully for every transaction.</p><p><br /></p><p>Quiz: How many 9-digit numbers are there that don’t start with zero and do not have any adjacent identical digits? (Example: 945895454 would be OK; 944895454 would not because of the “44”.)</p><p><br /></p><p>Mike[/QUOTE]</p><p><br /></p>

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