MathDB

2

Part of CNCM Online Round 1

Problems(1)

CNCM Online R1P2

Source:

9/2/2020
Akshar is reading a 500500 page book, with odd numbered pages on the left, and even numbered pages on the right. Multiple times in the book, the sum of the digits of the two opened pages are 1818. Find the sum of the page numbers of the last time this occurs.
Proposed by Minseok Eli Park (wolfpack)