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...

perfect number (also called multiperfect number or pluperfect number) is a generalization of a perfect number. For a given natural number k, a number...

Are there infinitely many unitary perfect numbers? More unsolved problems in mathematics A unitary perfect number is an integer which is the sum of its...

mathematics, an almost perfect number (sometimes also called slightly defective or least deficient number) is a natural number n such that the sum of...

Perfect Number (Korean: 용의자X; RR: Yonguija X; lit. Suspect X) is a 2012 South Korean mystery-drama film directed by Bang Eun-jin. Adapted from Keigo Higashino's...

include quintuplets, quadruplets, and triplets). 90 is the third unitary perfect number (after 6 and 60), since it is the sum of its unitary divisors excluding...

6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number. A six-sided polygon is a hexagon,...

Higashino, which had earlier been made into the 2012 South Korean film Perfect Number by Bang Eun-jin. The film is produced under the banner 12th Street Entertainment...

symmetry. A cube number, or a perfect cube, or sometimes just a cube, is a number which is the cube of an integer. The non-negative perfect cubes up to 603...

In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with...

In number theory, a perfect totient number is an integer that is equal to the sum of its iterated totients. That is, one applies the totient function...

(twenty-eight) is the natural number following 27 and preceding 29. Twenty-eight is a composite number and the second perfect number as it is the sum of its...

not a number and there are no unique numbers (e.g., any two units from indefinitely many units is a 2). However, in the definition of perfect number which...

plus perfect number) in a given number base b {\displaystyle b} is a number that is the sum of its own digits each raised to the power of the number of...

5 Is the Perfect Number (Italian: 5 è il numero perfetto) is a 2019 Italian thriller drama film directed by Igort, based on his 2002 homonymous graphic...

hexagonal number can only be 1, 3, 6, or 9. The digital root pattern, repeating every nine terms, is "1 6 6 1 9 3 1 3 9". Every even perfect number is hexagonal...

numbers whose arithmetic mean of divisors is the first perfect number and unitary perfect number, 6 (that is also the smallest semiprime with distinct...

a perfect number, the number 6. The number 10 was thought perfect because there are 10 fingers to the two hands. The number 6 was believed perfect for...

its proper divisors. A semiperfect number that is equal to the sum of all its proper divisors is a perfect number. The first few semiperfect numbers are:...

Trent Perfect graph Perfect group Perfect lattice (same as perfect form) Perfect matrix Perfect number Perfect power Perfect set Chip Perfect, American...

numbers and perfect numbers is between 0.2474 and 0.2480. An abundant number which is not the multiple of an abundant number or perfect number (i.e. all...

times 1476 = coreful perfect number 1477 = 7-Knödel number 1478 = total number of largest parts in all compositions of 11 1479 = number of planar partitions...

Mersenne primes and perfect numbers are two deeply interlinked types of natural numbers in number theory. Mersenne primes, named after the friar Marin...

Mersenne prime. No odd perfect numbers are known; hence, all known perfect numbers are triangular. For example, the third triangular number is (3 × 2 =) 6, the...

lowest number of squares needed for a perfect tiling of a rectangle is 9. 9 is the largest single-digit number in the decimal system. Nine is a number that...

"Perfect" is a song by English singer-songwriter Ed Sheeran from his third studio album, ÷ (2017). After the album's release, it charted at number four...

is the second perfect number. Mathematics: 30 is the smallest sphenic number. Mathematics: 36 is the smallest number which is a perfect power but not...

that every perfect number is a harmonic divisor number and conjectured that there are no odd harmonic divisor numbers other than 1. The number 6 has the...

integer following 8127 and preceding 8129. It is most notable for being a perfect number (its proper divisors 1, 2, 4, 8, 16, 32, 64, 127, 254, 508, 1016, 2032...

25 has an even aliquot sum of 6, which is itself the first even and perfect number root of an aliquot sequence; not ending in (1 and 0). It is the smallest...