Oblong numbers are of the form

To find solutions to

We can write

Or

the integer length of is

Here are the first few solutions

**n = 1**

**n = 2**

**n = 3, 4 : no solutions**

**n = 5 **

**n = 6**

**n = 7**

**n = 8, 9 : no solutions**

**n = 10**

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