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100 prisoners problem. Each prisoner has to find their own number in one of 100 drawers, but may open only 50 of the drawers. The 100 prisoners problem is a mathematical problem in probability theory and combinatorics. In this problem, 100 numbered prisoners must find their own numbers in one of 100 drawers in order to survive.
A cluster prime is a prime p such that every even natural number k ≤ p − 3 is the ... Primes p that divide 2 n − 1, for some prime number n. 3, 7, 23, 31, 47 ...
Perfect number. In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.
A number where some but not all prime factors have multiplicity above 1 is neither square-free nor squareful. The Liouville function λ(n) is 1 if Ω(n) is even, and is -1 if Ω(n) is odd. The Möbius function μ(n) is 0 if n is not square-free. Otherwise μ(n) is 1 if Ω(n) is even, and is −1 if Ω(n) is odd.
So, 6 is a perfect number because the proper divisors of 6 are 1, 2, and 3, and 1 + 2 + 3 = 6. [2] [4] There is a one-to-one correspondence between the Mersenne primes and the even perfect numbers, but it is unknown whether there exist odd perfect numbers or not.
The percentage of odd numbers clearly becomes very low and the percentage of even numbers seems to approach 100. If we look at the formula and let n →∞, So 100% of the numbers are even, (although they are not)! n % odd % even n % odd % even 1 100 0 11 8.4 91.6 2 90 10 12 6.3 93.7 3 75 25 13 4.8 95.2 4 59.6 40.4 14 3.6 96.4 5 46 54 15 2.7 97.3
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