What are the missing numbers in the pyramids?
Two brothers were left some money, amounting to an exact number of
pounds, to divide between them. DEE undertook the division. "But
your heap is larger than mine!" cried DUM...
The well known Fibonacci sequence is 1 ,1, 2, 3, 5, 8, 13, 21....
How many Fibonacci sequences can you find containing the number 196
as one of the terms?
The number 27 is special because it is three times the sum of
Find some two digit numbers that are SEVEN times the sum of
their digits (seven-up numbers)?
Are there any three digit 'seven-up' numbers. Is it possible to
find a number K such that there is a three digit number that is K
times the sum of its digits (a K-up number)?