Hello greg2342,
There is no guaranteed credit except with patents or recognized (peer-reviewed / refereed) research journals. There are online journals that accept messages at the editor's discretion. But any publication gives you a good chance at priority and credit.
The academic rules for credit emphasize publication and secondarily but almost as importantly peer-review.

Lawrence

Added: There is a lot of math in small fields that is not published because everybody (in that field) knows it but the first person to publish it in a review article or text book will gain the credit (and the scorn of his colleagues). Just one of the flaws with the current system of credit.