interesting natural numbers and their properties
find details on a family of integer numbers
a-pointer ABA 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 Curzon cyclic D-number d-powerful de Polignac decagonal deceptive deficient dig.balanced double fact. Duffinian economical emirp emirpimes enlightened equidigital eRAP Eulerian evil factorial fibodiv Fibonacci Friedman frugal Gilda Giuga good prime happy harmonic Harshad heptagonal hex hexagonal highly composite hoax Hogben Honaker house hungry hyperperfect 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 octagonal odious Ormiston palindromic 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 Rhonda Ruth-Aaron Saint-Exupery Sastry self self-describing semiprime Smith sphenic square straight-line strobogrammatic strong prime subfactorial super Niven super-d superabundant tau tcefrep tetrahedral tetranacci triangular tribonacci trimorphic twin Ulam undulating unprimeable untouchable upside-down vampire wasteful weak prime weakly prime weird Wieferich Woodall Zeisel Zuckerman Zumkeller zygodrome

e-mail: info -at- numbersaplenty.com