- a
semiperfect number or
pseudoperfect number is a
natural number n that is
equal to the sum of all or some of its
proper divisors. A
semiperfect number...
- side but not the other.
Perfect rings were
introduced in B****'s book. A
semiperfect ring is a ring over
which every finitely generated left
module has a...
-
Granville numbers. A
semiperfect number is a
natural number that is
equal to the sum of all or some of its
proper divisors. A
semiperfect number that is equal...
- theory, a
weird number is a
natural number that is
abundant but not
semiperfect. In
other words, the sum of the
proper divisors (divisors
including 1...
- to the
number 30, this is the
longest Aliquot Sequence. It is also: A
semiperfect number,
since adding some
subsets of its
divisors (e.g., 5, 10 and 15)...
- of Euler's
totient function φ(x) over the
first sixteen integers. a
semiperfect number,
since adding up some
subsets of its
divisors (e.g., 1, 4, 5,...
- In mathematics, a
semiperfect magic cube is a
magic cube that is not a
perfect magic cube, i.e., a
magic cube for
which the
cross section diagonals do...
-
semiperfect cube of
order 64 and a
perfect cube of
order 256. It also
reports that he
discovered the only two
known tetramagic cubes, a
semiperfect cube...
- 100 can be
expressed as a sum of some of its divisors,
making it a
semiperfect number. The
geometric mean of its nine
divisors is 10. 100 is the sum...
- 90,144,259,45,33,15,9,4,3,1,0) to the
Prime in the 3-aliquot tree. a
semiperfect number, as a
multiple of a
perfect number. the 12th
triangular number...
