No
Chat with our AI personalities
24017604
Since the numbers begin with 123, they all contain a 3. As a result, they all "contain 3 or 7". So the remaining 4 digits can be any digits and this gives 104 = 10,000 such numbers.
An infinite number.
1000
Yes. Select any triple and if the first one is not even, then double all three numbers. For example, (3, 4, 5) gives (6, 8, 10).