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	212
Problem 2734. N-th Odious Created by: Jan Orwat Tags pop series, number theory, oeis	1	117
Problem 2733. Evil Number Created by: Jan Orwat Tags pop series, number theory, easy	2	178
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	3	196
Problem 2674. Generalised Hamming Number Created by: Jean-Marie Sainthillier Tags hamming	7	98
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	5	101
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags a138591, number theory	2	113
Problem 2248. Bell Number calculator Created by: robin Tags sets, partition	2	114
Problem 2061. Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	2	208
Problem 2056. Is this number Munchhausen Narcissistic? Created by: Ted Tags math, narcissistic number, munchhausen	2	127
Problem 1997. Compute Fibonacci Number Created by: Alexander Tags numbers, fibonacci	3	268
Problem 1925. Smith numbers Created by: Sky Sartorius Tags factors, sum	3	183
Problem 1826. Find vampire numbers Created by: Andrew Newell Tags number theory, factors	6	109
Problem 1771. Polygonal numbers Created by: Jan Orwat Tags polygonal, sequence, number theory	3	90
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	2	62
Problem 1472. nth Rational Number Created by: G K Tags math	1	102
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	2	208
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	3	218
Problem 139. Determine if a Given Number is a Triangle Number Created by: @bmtran (Bryant Tran) Tags triangle numbers	6	290

Recent Group Finishers50

Recent Activity

	Michela Bona submitted Solution 2178711 to Problem 2690. Armstrong Number 22 hours and 34 minutes ago
	Michela Bona submitted Solution 2178703 to Problem 2733. Evil Number 22 hours and 41 minutes ago
	Michela Bona submitted Solution 2178688 to Problem 2734. N-th Odious 22 hours and 56 minutes ago
	Hamza Maqbool submitted Solution 2174153 to Problem 139. Determine if a Given Number is a Triangle Number on 25 Mar 2020 at 11:36
	Hamza Maqbool submitted Solution 2174152 to Problem 156. Parasitic numbers on 25 Mar 2020 at 11:34