Magic Numbers

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

Magic Numbers Master

+50 points

Problem Title	Likes	Solvers
Problem 2819. Find the 9's Complement Created by: Pritesh Shah Tags matlab	3	206
Problem 2734. N-th Odious Created by: Jan Orwat Tags pop series, number theory, oeis	1	112
Problem 2733. Evil Number Created by: Jan Orwat Tags pop series, number theory, easy	2	169
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	3	187
Problem 2674. Generalised Hamming Number Created by: Jean-Marie Sainthillier Tags hamming	7	94
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	5	97
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags a138591, number theory	2	109
Problem 2248. Bell Number calculator Created by: robin Tags sets, partition	2	112
Problem 2061. Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	2	199
Problem 2056. Is this number Munchhausen Narcissistic? Created by: Ted Tags math, narcissistic number, munchhausen	2	122
Problem 1997. Compute Fibonacci Number Created by: Alexander Tags numbers, fibonacci	3	262
Problem 1925. Smith numbers Created by: Sky Sartorius Tags factors, sum	3	177
Problem 1826. Find vampire numbers Created by: Andrew Newell Tags number theory, factors	6	104
Problem 1771. Polygonal numbers Created by: Jan Orwat Tags polygonal, sequence, number theory	3	87
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	2	59
Problem 1472. nth Rational Number Created by: G K Tags math	1	100
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	2	203
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	3	210
Problem 139. Determine if a Given Number is a Triangle Number Created by: @bmtran (Bryant Tran) Tags triangle numbers	6	286

Recent Group Finishers49

Recent Activity

	India Moore submitted Solution 2077349 to Problem 2690. Armstrong Number on 2 Jan 2020 at 23:28
	India Moore submitted Solution 2077336 to Problem 2733. Evil Number on 2 Jan 2020 at 23:12
	India Moore submitted Solution 2077307 to Problem 2734. N-th Odious on 2 Jan 2020 at 22:37
	India Moore submitted Solution 2077294 to Problem 2819. Find the 9's Complement on 2 Jan 2020 at 22:01
	Asif Newaz submitted Solution 2075497 to Problem 1742. Generate a Parasitic Number on 31 Dec 2019 at 16:52