Register
We are really pleased that you are interested in joining the Project Euler community. Hopefully you have already taken the time to look at problems in the Archives to see what challenges lie ahead.
To complete registration, we would like you to get a real taste of Project Euler problems for yourself by solving "Problem Zero". The problems will certainly become more difficult and you are going to require a growing combination of mathematical knowledge and programming skills as you progress through the problem set. So, if you enjoy being challenged and would like to develop your problem solving skills, then to quote the sentiments of Plato: "Let none but enquiring minds enter".
Problem Zero
A number is a perfect square, or a square number, if it is the square of a positive integer.
For example, $25$ is a square number because $5^2 = 5 \times 5 = 25$; it is also an odd square.
The first 5 square numbers are: $1, 4, 9, 16, 25$, and the sum of the odd squares is $1 + 9 + 25 = 35$.
Among the first 339 thousand square numbers, what is the sum of all the odd squares?
NOTE: The numbers in the problem are randomised for each visitor. It will remain fixed for a period of time, but if you leave the page, please check it has not changed and you are solving the problem for the correct value.