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Factorion
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Mathematics
Fields of mathematics
Dynamical systems
Arithmetic dynamics
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1970-01-01
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A
**
factorion
** is
a
special type of
number
in
mathematics
that is equal to the sum of the
factorials
of its digits. In other
words
,
a
number
\(
n
\) is
a
factorion
if: \[
n
=
d
_
1
! +
d
_
2
! +
d
_
3
! + \ldots +
d
_
k
! \] where \(
d
_
1
,
d
_
2
, \ldots,
d
_
k
\) are the digits of \(
n \)
, and \( !
Ancestors
(5)
Arithmetic dynamics
Dynamical systems
Fields of mathematics
Mathematics
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