Is it possible to write down 1,2,3..100 in some order (one after an other), such that the sum of any two adjacent numbers is a prime number?
Is it possible to write all integer from 1 to 10 in a row in some order such that any two adjacent number add up to a prime number ?
First 17 positive integers (1..17) are rearranged into a sequence such that the sum of any two adjacent terms is a perfect square. What is the sum of the first and last terms of this sequence?
Using 1, 2, 3, 4 & 5 in any order and the operators + - % * each exactly once what is the greatest possible value that you can make?
