the natural number Euler's number
prime or commonOrdinal number
The natural numbers are also called the counting numbers.
A multiple of a natural number should be another natural number.
Natural numbers or integers are other names for counting numbers.
Another name for a set of natural numbers is counting numbers.
Another word for natural fertilizers is organic fertilizers.
Another natural number, ten times as large.
natural gas is another name for methane
natural from the earth