# Astonishing Numbers

• Published in 2001
In the collections
We say that an ordered pair of positive integers $a,b$ with $a \lt b$ is astonishing if the sum of the integers from $a$ to $b$, inclusive, is equal to the digits of $a$ followed by the digits of $b$. Determine all astonishing ordered pairs.

### BibTeX entry

@article{AstonishingNumbers,
title = {Astonishing Numbers},
abstract = {We say that an ordered pair of positive integers $a,b$ with $a \lt b$ is astonishing if the sum of the integers from $a$ to $b$, inclusive, is equal to the digits of $a$ followed by the digits of $b$. Determine all astonishing ordered pairs.},