11XX 


Number theory 

11Axx 

Elementary number theory {For analogues in number fields, see 11R04} 


11A05 
Multiplicative structure; Euclidean algorithm; greatest common divisors 


11A07 
Congruences; primitive roots; residue systems 


11A15 
Power residues, reciprocity 


11A25 
Arithmetic functions; related numbers; inversion formulas 


11A41 
Primes 


11A51 
Factorization; primality 


11A55 
Continued fractions {For approximation results, see 11J70} [See also 11K50, 30B70, 40A15] 


11A63 
Radix representation; digital problems {For metric results, see 11K16} 


11A67 
Other representations 


11A99 
None of the above, but in this section 