1st is 330
8th is 400
18th is 500
24th is 560
Answer: 24
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There are infinitely many answers. 1 and 325 (multiplied), or 1 and 324 (added) are two examples.
The sum of all integers between 1 and 25 is equal to (25 x (25 - 1))/2 = 325.
5 x 65 is one of many solutions
All the multiples of 325 (which are infinite), starting with: 325, 650, 975, 1300, 1625, 1950, 2275 . . .
Any number that ends with 0 or 5 is divisible by 5.