Question 992609
What is the smallest value of +f+ that statisfies +a%5E2%2Bb%5E2%2Bc%5E2%2Bd%5E2=f%5E2+, given that +a+, +b+, +c+, +d+, +e+ and +f+ are all positive integers, not necessarily different? 
:
How about f = 7
 {{{1^2 + 2^2 + 2^2 + 2^2 + 6^2 = 7^2}}}