I’m looking at a banner ad that says
Q. Which is not like the others? 63 57 98 01
I saw quickly that none are prime (1 is usually not counted as prime, so that each integer’s prime factorization is unique) and then that two of the four are divisible by 3, and then a long pause before I saw that only one is even. Does that say something about me?
Only one is divisible by nine, as well.
What does it matter if one’s divisible by two? Only one is the logarithm of a certain number regardless of base. Only one has a superfluous digit. Only one is not a composite number. Only one has a prime factor larger than 10.
Even? So what?
I don’t see 00 in the list, so which one is “the logarithm of a certain number regardless of base”?
I saw 01 is divisible by 1, 98 is divisible by 2 and 57 is divisible by 3 but 63 is NOT divisible by 4. I think 98 being the only even number is the simplest answer.