Mailto with column value in subject

Hi,

I have a list with a few columns and I want to create a calculated column that will build amailto:a@a.com?subject[column1].

I tried using concatenate but the outcome shows the html syntax rather than the link....

My syntax in the calculated column:

=CONCATENATE("<a href=mailto:a@a.com?SUBJECT=",[column1],">LINK</a>")

Any thoughts?

Thanks a lot in advance