A century ago vs. century ago [closed]

I would like to know which one is correct and if both are correct what is the difference. I want to say that some work was done more than 100 years ago.

Do I say:

This was done more than a century ago.

or

This was done more than century ago.

Somehow, I feel that the option including an article is correct in this case, but I am curious whether the other might be correct as well.


Solution 1:

The article should be included.

Century is a singular word and requires the use of an article when used like this.