In how many positive four-digit integers that are not multiples of do the digits form a geometric sequence? (The digits must form a geometric sequence, in order. For example, the number 8412 does not count.)

Guest Mar 2, 2021

#2**0 **

In how many positive four-digit integers that are not multiples of 1111 do the digits form a geometric sequence? (The digits must form a geometric sequence, in order. For example, the number 8412 does not count.)

Guest Mar 2, 2021

#3**0 **

multiplying by 2: 1248

dividing by 2: 8421

multiplying or dividing any more will go into double digits, so only $\boxed{2}$(unless I made a mistake).

SparklingWater2 Mar 2, 2021