To count numbers greater than zero {positive number} or less than zero {negative number} use signed whole numbers and zero {integer}, such as -9, 0, +9.
Integers can be function domain J, and positive integers can be function domain J+.
sums
Positive integers are sums of at most four squares. Integers are sums of at most 19 quarts. Positive even integers are sums of not more than four primes. Odd integers are sums of not more than three primes.
primes
Are there infinitely many positive integers, so both one less and one more are prime?
Mathematical Sciences>Number Theory>Number Types
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Date Modified: 2022.0224