— Scheme Procedure: odd? n
— C Function: scm_odd_p (n)

Return #t if n is an odd integer, #f otherwise.

— Scheme Procedure: even? n
— C Function: scm_even_p (n)

Return #t if n is an even integer, #f otherwise.

— Scheme Procedure: quotient

Return the quotient of the numbers x and y.

— Scheme Procedure: remainder

Return the remainder of the numbers x and y.

          (remainder 13 4) ⇒ 1
          (remainder -13 4) ⇒ -1

— Scheme Procedure: modulo

Return the modulo of the numbers x and y.

          (modulo 13 4) ⇒ 1
          (modulo -13 4) ⇒ 3

— Scheme Procedure: gcd

Return the greatest common divisor of all arguments. If called without arguments, 0 is returned.

— Scheme Procedure: lcm

Return the least common multiple of the arguments. If called without arguments, 1 is returned.