MO 2016 Numerical axis

Cat's school uses a special numerical axis. The distance between the numbers 1 and 2 is 1 cm, the distance between the numbers 2 and 3 is 3 cm, between the numbers 3 and 4 is 5 cm, and so on, and the distance between the next pair of natural numbers is always increased by 2 cm.

Which of two natural numbers is a 39 cm distance on the Cat's numerical axis?

Find all solutions.

Correct answer:

n =  2

Step-by-step explanation:

6, 9; 20, 21 n=2



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