Magic Numbers (Public)

Identify or generate numbers belonging to named sets such as Rational, Armstrong, and Fibonacci.

Magic Numbers Master

+50 points

Problem Title	Likes	Solvers
Find the 9's Complement Created by: Pritesh Shah Tags matlab	3	183
N-th Odious Created by: Jan Orwat Tags pop series, number theory, oeis	1	102
Evil Number Created by: Jan Orwat Tags pop series, number theory, easy	2	161
Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	3	168
Generalised Hamming Number Created by: Jean-Marie Sainthillier Tags hamming	6	70
Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	5	92
Polite numbers. N-th polite number. Created by: Jan Orwat Tags a138591, number theory	2	103
Bell Number calculator Created by: robin Tags sets, partition	2	107
Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	2	186
Is this number Munchhausen Narcissistic? Created by: Ted Tags math, narcissistic number, munchhausen	2	116
Compute Fibonacci Number Created by: Alexander Tags numbers, fibonacci	3	244
Smith numbers Created by: Sky Sartorius Tags factors, sum	2	143
Find vampire numbers Created by: Andrew Newell Tags number theory, factors	5	81
Polygonal numbers Created by: Jan Orwat Tags polygonal, sequence, number theory	3	84
Generate a Parasitic Number Created by: James Tags parasitic, cyclic	2	57
nth Rational Number Created by: G K Tags math	2	99
Kaprekar numbers Created by: the cyclist Tags kaprekar	2	195
Parasitic numbers Created by: the cyclist Tags parasitic	3	203
Determine if a Given Number is a Triangle Number Created by: @bmtran (Bryant Tran) Tags triangle numbers	7	276

Magic Numbers (Public)

Suggested Problems

Select a Web Site

How to Get Best Site Performance

Americas

Europe

Asia Pacific