There's Too Many Numbers To List Out!
Number Theory
Level
1
\[ \begin{eqnarray} && 3,6,9,12,15,\ldots \\ &&5,10,15,20,25, \ldots \\ &&7,14,21,28,35,\ldots \end{eqnarray} \]
The above shows 3 distinct arithmetic progressions. What is the smallest number that appears in all 3 rows?
by
Pi Han Goh