Number theory

Average Problem Difficulty:

 "its a very interesting number"

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Problem Title	Likes	Solvers
Problem 45272. Pseudo-vampire number Created by: Asif Newaz Tags numbers, number theory, sequence	2	29
Problem 45253. Pell numbers Created by: Asif Newaz Tags number, sequence, pell	2	70
Problem 45249. Frugal number Created by: Asif Newaz Tags number, frugal, economical	2	47
Problem 45250. Be happy Created by: Asif Newaz Tags number, happy	3	32
Problem 45229. Bell Triangle Created by: Asif Newaz Tags number, matrix, Magic Numbers	2	49
Problem 45223. find nth even fibonacci number Created by: Asif Newaz Tags series, number, fibonacci	2	70
Problem 45194. Cantor counting Created by: Asif Newaz Tags cantor, rational number	4	35
Problem 45192. check whether a number is a pentatope number Created by: Asif Newaz Tags pentatope	2	61
Problem 45191. generate nth pentatope number Created by: Asif Newaz Tags number, pentatope	4	65
Problem 1804. Fangs of a vampire number Created by: Andrew Newell Tags factors, number theory	5	98
Problem 1825. Find all vampire fangs Created by: Andrew Newell Tags factors, number theory	2	70
Problem 74. Balanced number Created by: Cody Team Tags matlab	22	3034
Problem 81. Mandelbrot Numbers Created by: Cody Team Tags matlab, fractals	16	1744
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	4	299
Problem 165. Woodall number Created by: the cyclist Tags woodall number theory	2	166
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	5	282
Problem 235. Project Euler: Problem 4, Palindromic numbers Created by: Doug Hull Tags projecteuler	13	1148
Problem 45274. Fangs of pseudo-vampire number Created by: Asif Newaz Tags number theory, vampire	2	24
Problem 249. Project Euler: Problem 9, Pythagorean numbers Created by: Doug Hull Tags projecteuler	10	1301
Problem 525. Mersenne Primes Created by: Drew Weymouth Tags math, prime, integers	6	840
Problem 896. Sophie Germain prime Created by: Aurelien Queffurust Tags prime, primes, sophie germain	4	905
Problem 1008. Determine if input is a Narcissistic number Created by: Binbin Qi Tags mod floor	2	200
Problem 1012. Determine if input is a perfect number Created by: Binbin Qi Tags mod sum, perfect	4	242
Problem 933. Ordinal numbers Created by: Tim Tags ordinal, lookup table	2	254
Problem 1082. Lychrel Number Test (Inspired by Project Euler Problem 55) Created by: @bmtran (Bryant Tran) Tags projecteuler, plus15	1	102
Problem 1095. Circular Primes (based on Project Euler, problem 35) Created by: James Tags primes, projecteuler, circular reasoning	9	571
Problem 1096. Largest Twin Primes Created by: Des Mc Manus Tags primes	4	832
Problem 1190. Golomb's self-describing sequence (based on Euler 341) Created by: James Tags projecteuler, self-referential, golomb sequence	3	164
Problem 1407. Is it an Armstrong number? Created by: Harish Maradana Tags armstrong no	3	328
Problem 1477. Champernowne Constant Created by: G K Tags math	3	79
Problem 45251. Last non-zero digit Created by: Asif Newaz Tags number, factorial	1	36
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	7	88
Problem 1925. Smith numbers Created by: Sky Sartorius Tags sum, factors	5	678
Problem 2733. Evil Number Created by: Jan Orwat Tags easy, number theory, oeis	3	261
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	8	343
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 2056. Is this number Munchhausen? Created by: Ted Tags math, narcissistic number, munchhausen	3	198
Problem 1298. P-smooth numbers Created by: Richard Zapor Tags primes, find, mod	1	88
Problem 44836. Iccanobif numbers 1 Created by: James Tags fibonacci, iccanobif	3	61
Problem 44748. Amicable numbers Created by: vandeleeuw Tags number theory, divisors	2	69
Problem 44385. Extra safe primes Created by: Matthew Eicholtz Tags prime numbers, cody5, safe prime	12	741
Problem 44360. Pentagonal Numbers Created by: goc3 Tags series, number, sequence	12	657

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Recent Activity

	Annika submitted Solution 14603135 to Problem 45249. Frugal number on 8 Apr 2025 at 17:52
	Annika submitted Solution 14603126 to Problem 45249. Frugal number on 8 Apr 2025 at 17:44
	Suraj submitted Solution 14557441 to Problem 44748. Amicable numbers on 23 Feb 2025
	Suraj submitted Solution 14557438 to Problem 1407. Is it an Armstrong number? on 23 Feb 2025
	Suraj submitted Solution 14557436 to Problem 2061. Narcissistic number ? on 23 Feb 2025

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