Chapter
I. Perfect, multiply perfect , and amicable numbers
II. Formulas for the number and sum of divisors, problems of Fermat and Wallis
III. Fermat's and Wilson's theorems, generalizations and converses; symmetric functions of ; ,2,ldots,p-1 ; modulo p
IV. Residue of ; u^p-1-1)/ ; modulo p
V. Euler's ; h ; function, generalizations; Farey series
VI. Periodic decimal fractions; periodic fraction; factors of ; 0^nplusminus ;
VII. Primitive roots, exponents, indices, binomial congruences
VIII. Higher congruences
IX. Divisibility of factorials and multinomial coefficients
X. Sum and number of divisors
XI. Miscellaneous theorems on divisibility, greatest common divisor, least common multiple
XII. Criteria for divisiblity by a given number
XIII. Factor tables, lists of primes
XIV. Methods of factoring
XV. Fermat numbers ; _n=2^2^n+ ;
XVI. Factors of ; ^nplusminus b^ ;
XVII. Recurring series; Lucas' ; _n,v_ ;
XVIII. Theory of prime numbers
XIX. Inversion of functions; Mobius' function ; u(n ; numerical integrals and derivatives
XX. Properties of the digits of numbers