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Numbers - Hard

Some more numbers of note, but harder this time.
Quiz by
BashfultheCat
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Last updated: November 5, 2025
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First submittedOctober 22, 2025
Times taken8
Average score40.0%
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Hint
Answer
A quaternion with every coefficient equal to 1
1 + i + j + k
The smallest number greater than all natural numbers
ω
The third Mersenne prime
31
The factorial of 6
720
A number than can never be reached by exponentiation of real numbers except by using itself as the base
0
Hint
Answer
A number smaller than all real numbers yet larger than 0
ε
The first number that is semiprime and a Fibonacci number
21
The number 115 in hexadecimal
73
The cardinality of the set of natural numbers
ℵ₀
The value of e to the power of i times pi
-1
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