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	204
Problem 2734. N-th Odious Created by: Jan Orwat Tags pop series, number theory, oeis	1	111
Problem 2733. Evil Number Created by: Jan Orwat Tags pop series, number theory, easy	2	168
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	3	184
Problem 2674. Generalised Hamming Number Created by: Jean-Marie Sainthillier Tags hamming	7	90
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	5	96
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags a138591, number theory	2	108
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	198
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	260
Problem 1925. Smith numbers Created by: Sky Sartorius Tags factors, sum	3	171
Problem 1826. Find vampire numbers Created by: Andrew Newell Tags number theory, factors	6	99
Problem 1771. Polygonal numbers Created by: Jan Orwat Tags polygonal, sequence, number theory	3	86
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	2	58
Problem 1472. nth Rational Number Created by: G K Tags math	1	100
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	2	202
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 Finishers48

Recent Activity

	Le Huu Hai submitted Solution 2024899 to Problem 2734. N-th Odious on 17 Nov 2019 at 8:50
	Le Huu Hai submitted Solution 2024893 to Problem 2819. Find the 9's Complement on 17 Nov 2019 at 8:46
	Son Pham submitted Solution 2009023 to Problem 2734. N-th Odious on 8 Nov 2019
	Son Pham submitted Solution 2009012 to Problem 2819. Find the 9's Complement on 8 Nov 2019
	Asif Newaz submitted Solution 2001423 to Problem 1472. nth Rational Number on 3 Nov 2019