If the paper is easily understood by the average mathematician, I suggest you consider submitting it to the [American Mathematical Monthly][1]. From the website:

Articles may be expositions of old or new results, historical or biographical essays, speculations or definitive treatments, broad developments, or explorations of a single application. Novelty and generality are far less important than clarity of exposition and broad appeal.

 

Notes are short, sharply focused, and possibly informal. They are often gems that provide a new proof of an old theorem, a novel presentation of a familiar theme, or a lively discussion of a single issue.

(italics mine) [1]: http://www.maa.org/pubs/monthly.html

If the paper is easily understood by the average mathematician, I suggest you consider submitting it to the American Mathematical Monthly. From the website:

Articles may be expositions of old or new results, historical or biographical essays, speculations or definitive treatments, broad developments, or explorations of a single application. Novelty and generality are far less important than clarity of exposition and broad appeal.

Notes are short, sharply focused, and possibly informal. They are often gems that provide a new proof of an old theorem, a novel presentation of a familiar theme, or a lively discussion of a single issue.

(italics mine)