11XX NUMBER THEORY
 1100 General reference works (handbooks, dictionaries, bibliographies, etc.)
 1101 Instructional exposition (textbooks, tutorial papers, etc.)
 1102 Research exposition (monographs, survey articles)
 1103 Historical (must also be assigned at least one classification number from Section 01)
 1104 Explicit machine computation and programs (not the theory of computation or programming)
 1106 Proceedings, conferences, collections, etc.

11Axx Elementary number theory (For analogues in number fields, see 11R04)
(1)
 11Bxx Sequences and sets
 11Cxx Polynomials and matrices

11Dxx Diophantine equations [See also 11Gxx, 14Gxx]
(1)
 11Exx Forms and linear algebraic groups [See also 19Gxx] (For quadratic forms in linear algebra, see 15A63)
 11Fxx Discontinuous groups and automorphic forms [See also 11R39, 11S37, 14Gxx, 14Kxx, 22E50, 22E55, 30F35, 32Nxx] (For relations with quadratic forms, see 11E45)

11Gxx Arithmetic algebraic geometry (Diophantine geometry) [See also 11Dxx, 14Gxx, 14Kxx]
(1)
 11Hxx Geometry of numbers (For applications in coding theory, see 94B75)
 11Jxx Diophantine approximation, transcendental number theory [See also 11K60]
 11Kxx Probabilistic theory: distribution modulo 1; metric theory of algorithms
 11Lxx Exponential sums and character sums (For finite fields, see 11Txx)
 11Mxx Zeta and Lfunctions: analytic theory
 11Nxx Multiplicative number theory
 11Pxx Additive number theory; partitions
 11Rxx Algebraic number theory: global fields (For complex multiplication, see 11G15)
 11Sxx Algebraic number theory: local and padic fields

11Txx Finite fields and commutative rings (numbertheoretic aspects)
(1)
 11Uxx Connections with logic
 11Yxx Computational number theory [See also 1104]
 11Zxx Miscellaneous applications of number theory