I remember it well
I am a bit vague about my bank security number-
It is a four figure number (or possibly five);
It uses four different digits (or possibly five);
The first digit is four (or possibly five);
The second digit is four (or possibly five) and none of the other digits is smaller;
The number is a prime multiplied by four (or possibly five);
If you reverse the order of the digits you get a number which is the product of four (or possibly five) different primes;
In four (or possibly five) of these statements my first guess…
