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161 is a hexagonal pyramidal number. [1] 161 is a semiprime. Since its prime factors 7 and 23 are both Gaussian primes, 161 is a Blum integer. 161 is a palindromic number [2] 161 / 72 is a commonly used rational approximation of the square root of 5 and is the closest fraction with denominator <300 to that number.
In mathematics, a natural number n is a Blum integer if n = p × q is a semiprime for which p and q are distinct prime numbers congruent to 3 mod 4. [1] That is, p and q must be of the form 4t + 3, for some integer t. Integers of this form are referred to as Blum primes. [2] This means that the factors of a Blum integer are Gaussian primes with ...
Blum integers: 21, 33, 57, 69, 77, 93, 129, 133, 141, 161, 177, ... Numbers of the form pq where p and q are distinct primes congruent to 3 (mod 4). A016105: Magic numbers: 2, 8, 20, 28, 50, 82, 126, ... A number of nucleons (either protons or neutrons) such that they are arranged into complete shells within the atomic nucleus. A018226 ...
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In computer science, the median of medians is an approximate median selection algorithm, frequently used to supply a good pivot for an exact selection algorithm, most commonly quickselect, that selects the kth smallest element of an initially unsorted array.
A source tells PEOPLE that Blum, 48, has “had time to process everything,” nearly two months after Grohl, 55, announced that he’d become the father of a baby girl with a woman outside the ...
The weapon Blum devised to protect himself from being haunted by a movie flop was another big movie release, this one much more in line with Blumhouse's longtime strategy of making smart bets on ...
129 is the sum of the first ten prime numbers.It is the smallest number that can be expressed as a sum of three squares in four different ways: + +, + +, + +, and + +. 129 is the product of only two primes, 3 and 43, making 129 a semiprime.