Suggestions for number theory references include "Prime Numbers: A Computational Perspective" by Carl Pomerance, which is highly regarded. Other recommended texts are "Number Theory for Computing" by Yan, "A Computational Introduction to Number Theory and Algebra" by Shoup, and "Number Theory with Computer Applications" by Kumanduri. Additionally, a notable German reference is "Algorithmische Zahlentheorie" by Forster, though it may be harder to find. These resources cater to those with a foundational understanding of elementary number theory and algebra, offering insights into computational aspects of the field.