The datasheet for the LM117 and LM317 shows how to simply calculate the resistor values.
The input voltage must be at least 2V higher than the output voltage so your max output will be 13V, not 15V.
Your circuit is missing the important input and output capacitors.
With an input of 15V and an output of 1.25V and a current of 1.5A then the LM117 will be extremely hot (20.6W) and might shut down.