MathDB

1

Part of 2015 Paraguay Mathematical Olympiad

Problems(1)

2015 Paraguayan Mathematical Olympiad: Problem 1

Source:

10/4/2015
Alexa wrote the first 1616 numbers of a sequence: 1,2,2,3,4,4,5,6,6,7,8,8,9,10,10,11,…1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 10, 10, 11, … Then she continued following the same pattern, until she had 20152015 numbers in total. What was the last number she wrote?
algebra