What topics are covered in the course Elementary Theory of Numbers?
Divisibility, congruence, quadratic reciprocity, elementary results in quadratic forms, diophantine equations, and rational approximation to irrationals.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What topics are covered in the course Elementary Theory of Numbers?

### Input: Not applicable

### Response:
Divisibility, congruence, quadratic reciprocity, elementary results in quadratic forms, diophantine equations, and rational approximation to irrationals.<|im_end|>