Short Number Strings

finding or developing a compressing technique, which can compress a 7 number string i.e., 11,10,1,2,10,7,5 down to 6 or 5 lossless, that would be amazing.

I already researched many compression technique; Huffman, Run-Length and LZ78 which all do well on large data sets and I only have a few numbers. If it helps by converting the numbers to binary for better compression then I what to known. I know that a solution could be impossible as we would know about it already but may be someone knows a trick to get rid of one digit.