* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.
While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:
'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!