AMC 10A 2025 (Problem 5)
Consider the sequence of positive integers
What is the 2025th term in this sequence?
What is the 2025th term in this sequence?
The th part starts from , increases up to , and then decreases back to . Hence, the length of the th part is .
If is in the th part, then:
For the part:We want to find the 2025th number from the beginning.Therefore, we should find the th number in the th part.
(E)