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73 has 37 as the mirroring of its decimal digits. 73 is the 21st prime number, and 37 the 12th. The "mirror property" is fulfilled when 73 has a mirrored permutation of its digits (37) that remains prime. Similarly, their respective prime indices (21 and 12) in the list of prime numbers are also permutations of the same digits (1, and 2). 73 is ...
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A tetradic number, also known as a four-way number, is a number that remains the same when flipped back to front, flipped front to back, mirrored up-down, or flipped up-down. The only numbers that remain the same which turned up-side-down or mirrored are 0, 1, and 8, so a tetradic number is a palindromic number containing only 0, 1, and 8 as ...
A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.
A Georgia man was arrested Monday in the 1985 murder of two people at a church, after the original suspect spent two decades in prison.
For roughly half a decade, and for the vast majority of his groundbreaking career, Christian Pulisic could be confidently described as a winger.He was a versatile attacker who often wore a No. 10 ...
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2 and 5 remain the same when viewed upside down, and turn into each other when reflected in a mirror. In the display of a calculator that can handle hexadecimal, 3 would become E upon either reflection or upside down arrangement, but E being an even digit, the three cannot be used as the first digit because the reflected number will be even ...