Magic Numbers

Average Problem Difficulty:

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	4	336
Problem 2248. Bell Number calculator Created by: robin Tags sets, partition	2	182
Problem 2056. Is this number Munchhausen? Created by: Ted Tags math, narcissistic number, munchhausen	3	198
Problem 1925. Smith numbers Created by: Sky Sartorius Tags sum, factors	5	678
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	7	88
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	8	343
Problem 1472. nth Rational Number Created by: G K Tags math	2	161
Problem 1997. Compute Fibonacci Number Created by: Alex Tags numbers, fibonacci	6	491
Problem 1826. Find vampire numbers Created by: Andrew Newell Tags factors, number theory	11	350
Problem 2734. N-th Odious Created by: Jan Orwat Tags number theory, oeis, pop series	3	175
Problem 2733. Evil Number Created by: Jan Orwat Tags easy, number theory, oeis	3	261
Problem 2674. Generalised Hamming Number Created by: Jean-Marie Sainthillier Tags hamming	13	331
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	8	175
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags number theory, a138591	2	159
Problem 2061. Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	3	334
Problem 1771. Polygonal numbers Created by: Jan Orwat Tags number theory, sequence, polygonal	5	130
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	5	282
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	4	299
Problem 139. Determine if a Given Number is a Triangle Number Created by: @bmtran (Bryant Tran) Tags triangle numbers	7	383

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Recent Activity

	Sofia Alexy submitted Solution 14611984 to Problem 1997. Compute Fibonacci Number on 17 Apr 2025 at 3:36
	NAGAOKA submitted Solution 14588312 to Problem 1997. Compute Fibonacci Number on 28 Mar 2025 at 8:36
	NAGAOKA submitted Solution 14588311 to Problem 1997. Compute Fibonacci Number on 28 Mar 2025 at 8:35
	Maurizio De Angelis submitted Solution 14569495 to Problem 2733. Evil Number on 7 Mar 2025
	Maurizio De Angelis submitted Solution 14569493 to Problem 2819. Find the 9's Complement on 7 Mar 2025

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