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 ?
1, 2, 3, 4, 7, 6, 5, 8, 9, 10 1 + 2 = 3 2 + 3 = 5 3 + 4 = 7 4 + 7 = 11 7 + 6 = 13 6 + 5 = 11 5 + 8 = 13 8 + 9 = 17 9 + 10 = 19.
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?
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?
Given below is a figure. You have to fill in the numbers from 1 up to 16 in such a way that you get 29 when you add the numbers in each row.
