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An odd number does not have the prime factor 2. The first: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23 (sequence A005408 in the OEIS). All integers are either even or odd. A square has even multiplicity for all prime factors (it is of the form a 2 for some a). The first: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144 (sequence A000290 in the OEIS).
Some sequences have alternate names: 4n+1 are Pythagorean primes, 4n+3 are the integer Gaussian primes, and 6n+5 are the Eisenstein primes (with 2 omitted). The classes 10 n + d ( d = 1, 3, 7, 9) are primes ending in the decimal digit d .
525 = 3 × 5 2 × 7. It is palindromic in base ten, as well as the fifty-fifth self number greater than 1 in decimal. [36] It is also: the sum of all prime numbers that divide the orders of the twenty-six sporadic groups (2, 3, 5, ..., 71; aside from 53 and 61). [37] the sum of the dimensions of all five exceptional Lie algebras (14, 52, 78 ...
In base 10, raising the digits of 1306 to powers of successive integers equals itself: 1306 = 1 1 + 3 2 + 0 3 + 6 4. 135, 175, 518, and 598 also have this property. Centered triangular number. [125] 1307 = safe prime [22] 1308 = sum of totient function for first 65 integers; 1309 = the first sphenic number followed by two consecutive such number
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
The metric ton is the name used for the tonne (1000 kg, 2 204.622 62 lb), which is about 1.6% less than the long ton. The US customary system also includes the kip , equivalent to 1,000 pounds of force, which is also occasionally used as a unit of weight of 1,000 pounds (usually in engineering contexts).
872 = 2 3 × 109, refactorable number, nontotient, 872! + 1 is prime; 873 = 3 2 × 97, sum of the first six factorials from 1; 874 = 2 × 19 × 23, sphenic number, sum of the first 23 primes, sum of the first seven factorials from 0, nontotient, Harshad number, happy number; 875 = 5 3 × 7, unique expression as difference of positive cubes: [63 ...
← 0 100 200 300 400 500 600 700 800 900 ... as it is equal to the sum of some or all of its divisors. It's a Idoneal number. [1] It is a Harshad number, ...