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American savings bonds of 0 have Thomas Jefferson's portrait, while American 0 treasury bonds have Andrew Jackson's portrait.
The Kármán line lies at an altitude of 100 kilometres above the Earth's sea level and is commonly used to define the boundary between Earth's atmosphere and outer space.
There are exactly 100 prime numbers whose digits are in strictly ascending order (e.g.
100 is the smallest number whose common logarithm is a prime number (i.e.
It can not be expressed as the difference between any integer and the total of coprimes below it, making it a noncototient.It can be expressed as a sum of some of its divisors, making it a semiperfect number.100 is a Harshad number in base 10, and also in base 4, and in that base it is a self-descriptive number.