interesting natural numbers and their properties
Look up a positive integer
(max 15 digits)
find details on a family of integer numbers
a-pointer
ABA
aban
abundant
Achilles
admirable
alt.fact.
alternating
amenable
amicable
anti-perfect
apocalyptic
arithmetic
astonishing
automorphic
balanced p.
Bell
bemirp
betrothed
binomial
brilliant
c.decagonal
c.heptagonal
c.nonagonal
c.octagonal
c.pentagonal
c.square
c.triangular
cake
Canada
Carmichael
Carol
Catalan
Chen
compositorial
congruent
constructible
cube
Cullen
Cunningham
Curzon
cyclic
D-number
d-powerful
de Polignac
decagonal
deceptive
deficient
dig.balanced
double fact.
droll
Duffinian
eban
economical
emirp
emirpimes
enlightened
equidigital
eRAP
esthetic
Eulerian
evil
factorial
fibodiv
Fibonacci
Friedman
frugal
gapful
Gilda
Giuga
good prime
happy
harmonic
Harshad
heptagonal
hex
hexagonal
highly composite
hoax
Hogben
Honaker
house
hungry
hyperperfect
iban
iccanobiF
idoneal
impolite
inconsummate
insolite
interprime
Jacobsthal
Jordan-Polya
junction
Kaprekar
katadrome
Kynea
Lehmer
Leyland
lonely
Lucas
lucky
Lynch-Bell
m-pointer
magic
magnanimous
metadrome
modest
Moran
Motzkin
narcissistic
nialpdrome
nonagonal
nude
O'Halloran
oban
octagonal
odious
Ormiston
palindromic
palprime
pancake
panconsummate
pandigital
partition
pentagonal
perfect
pernicious
Perrin
persistent
Pierpont
plaindrome
Poulet
power
powerful
practical
prim.abundant
prime
primeval
primorial
pronic
Proth
pseudoperfect
rare
repdigit
repfigit
repunit
Rhonda
Ruth-Aaron
Saint-Exupery
Sastry
self
self-describing
semiprime
sliding
Smith
Sophie Germain
sphenic
square
star
straight-line
strobogrammatic
strong prime
subfactorial
super Niven
super-d
superabundant
tau
taxicab
tcefrep
tetrahedral
tetranacci
triangular
tribonacci
trimorphic
truncatable prime
twin
uban
Ulam
undulating
unprimeable
untouchable
upside-down
vampire
wasteful
weak prime
weakly prime
weird
Wieferich
Woodall
Zeisel
Zuckerman
Zumkeller
zygodrome
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