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the sum of the sum of the divisors of the first 7 positive integers. the smallest integer whose reciprocal has a 5-digit repetend. That is a consequence of the fact that 41 is a factor of 99999. the smallest integer whose square root has a continued fraction with period 3. [6] a prime index prime, as 13 is prime.
In mathematics. 37 is the 12th prime number, and the 3rd isolated prime without a twin prime. [1] 37 is the third star number [2] and the fourth centered hexagonal number. [3] The sum of the squares of the first 37 primes is divisible by 37. [4] 37 is the median value for the second prime factor of an integer. [5]
A prime number is any number that can be divided only by 1 and itself. For example, 3 is a prime number because the only numbers that divide it are 1 and 3. The number 4 is not, because it can be divided by 1, 2, and 4. The prime numbers are sometimes called the chemical elements of the numbers, because any integer can be expressed as a product ...
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.
In mathematics. 181 is prime, and a palindromic, [1] strobogrammatic, [2] and dihedral number [3] in decimal. 181 is a Chen prime. [4] 181 is a twin prime with 179, [5] equal to the sum of five consecutive prime numbers: [6] 29 + 31 + 37 + 41 + 43. 181 is the difference of two consecutive square numbers 91 2 – 90 2, [7] as well as the sum of ...
73 (also known as 73 Amateur Radio Today) was an amateur radio magazine published from 1960 to 2003. 73 was the number on the Torpedo Patrol (PT) boat in the TV show McHale's Navy. The registry of the U.S. Navy's nuclear aircraft carrier USS George Washington (CVN-73), named after U.S. President George Washington.
Seventeen is the only prime number which is the sum of four consecutive primes ( 2, 3, 5, and 7 ), as any other four consecutive primes that are added always generate an even number divisible by two. It forms a twin prime with 19, [2] a cousin prime with 13, [3] and a sexy prime with both 11 and 23. [4]
