Equinumerous
Let 
and 
be two classes of Positive integers. Let 
be the number of integers in which are less than orequal to 
, and let 
be the number of integers in which are less than or equal to . Then if
and are said to be equinumerous. The four classes of Primes 
, 
, 
, 
are equinumerous. Similarly, since and are both ofthe form 
, and and are both of the form 
, and are also equinumerous.
References
Shanks, D. Solved and Unsolved Problems in Number Theory, 4th ed. New York: Chelsea, pp. 21-22 and 31-32, 1993.
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