Findings:

• The set of rational numbers is countably infinite
• countable
• GpBCT: proof that Bob wins on a countable union of sets if he's guaranteed a win on each one of them
• second countable
• first countable
• Science is countable
• finite vs. countable vs. uncountable
• number mumbler (user)
• Random Numbers (user)
• interesting number
• atomic number
• number 6
• Number
• Number Nine
• magic number
• number one
• rational number
• Smallest number greater than 0
• computable number
• perfect number
• number two
• Little numbers on a piece of paper
• irrational number
• real number
• Number of the beast
• random number
• Numbers
• Erdős number
• Social Security number
• number theory
• imaginary number
• prime number
• random number generator
• single identification number
• natural number
• Think of a number
• Phone number
• Mixed Number
• Negative Number
• The Number of the Beast
• On computable numbers, with an application to the Entscheidungsproblem
• number crunching
• Proof of the existence of irrational numbers
• Proof that there is no largest prime number
• Fibonacci number
• Personal identification number
• Noding for Numbers
• cyclic numbers
• lucky number
• algebraic number
• transcendental number
• My experiment in not paying attention to numbers
• Rocket Number 9
• Avogadro's Number
• large number
• Odd numbered Star Trek movies suck
• complex number
• Random number node surfing
• What's your social security number?
• You are not a number
• Everything number presentation
• Harshad number
• Mersenne's number
• toll-free number
• big number
• Number 1
• Number 2
• Bacon number
• Numbers 1
• Numbers 4
• Numbers 5
• Numbers 6
• Numbers 7
• Numbers 8
• Numbers 9
• Numbers 11
• Numbers 10
• Numbers 12
• Numbers 13
• Numbers 2
• Numbers 3
• Numbers 14
• Numbers 15
• Numbers 16
• Numbers 17
• Numbers 18
• Numbers 19
• Numbers 20
• Numbers 21
• Numbers 22
• Numbers 23
• Numbers 24
• Numbers 25
• Numbers 26
• Numbers 27
• Numbers 28
• Numbers 29
• Numbers 30
• Numbers 31
• Numbers 32
• Numbers 33
• Numbers 34
• Numbers 36
• Numbers 35
• serial number
• The set of decimal representations of numbers divisible by 17 is regular
• Hailstone number sequence

If you Log in you could create a "countable ordinal number" node. If you don't already have an account, you can register here.