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There are five of them, including the number 1.
There are exactly 5,761,455 prime numbers below 100,000,000, the first being two, and the last 99,999,989.
56 + 56 + 28 + 8 + 2 + 1 = 151
The number that is halfway between one and one half (1½) and one (1) is one and one quarter (1¼)