I have found a pill that I cannot identify, actually two of them... descriptonare
1. white, round with numbers 5157. 2. white, long but somewhat oval shape, numbers 5113B. What are these medications?

Researching the numbers associated with the information you have provided here are the associated medications:

5157... Lisinopril (http://www.drugs.com/lisinopril.html)

5113... Acetaminophen-propoxyphen napsylate (http://www.arthritisinsight.com/medical/meds/darvocet.html)

Due to so many generic versions certain identifiers may not match. The best way to identify the medication of concern is to ask your local pharmacist who, I am sure, will be able to render an accurate identification for you.