# Help Finding the sum of the cubed and odd 5 digit numbers

PLEASE HELP!! im so stuck on this, working on it for days

Im trying to find the sum of the cubes of all the odd 5 digit numbers..

if you know a formula that works even with smaller numbers so i can try solving it also but i need the answer as well

## Answers and Replies

Hi Brookejewel!

Do you know a formula for all the cubes (up to a certain point). Let's disregard the fact that they have to be odd and have 5 digits.

Do you know a formula for

$$\sum_{i=1}^{1000000}{i^3}$$

for example? Once you know this formula, we will modify it to suit your purposes!