Number theory

Average Problem Difficulty:

 "its a very interesting number"

Community Group Solver

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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	46
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	3030
Problem 81. Mandelbrot Numbers Created by: Cody Team Tags matlab, fractals	16	1739
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	1146
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	1299
Problem 525. Mersenne Primes Created by: Drew Weymouth Tags math, prime, integers	6	839
Problem 896. Sophie Germain prime Created by: Aurelien Queffurust Tags prime, primes, sophie germain	4	904
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	241
Problem 933. Ordinal numbers Created by: Tim Tags ordinal, lookup table	2	252
Problem 1082. Lychrel Number Test (Inspired by Project Euler Problem 55) Created by: @bmtran (Bryant Tran) Tags projecteuler, plus15	1	100
Problem 1095. Circular Primes (based on Project Euler, problem 35) Created by: James Tags primes, projecteuler, circular reasoning	9	569
Problem 1096. Largest Twin Primes Created by: Des Mc Manus Tags primes	4	831
Problem 1190. Golomb's self-describing sequence (based on Euler 341) Created by: James Tags projecteuler, self-referential, golomb sequence	3	163
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	674
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

Recent Group Finishers20

Recent Activity

	Suraj submitted Solution 14557441 to Problem 44748. Amicable numbers on 23 Feb 2025 at 19:23
	Suraj submitted Solution 14557438 to Problem 1407. Is it an Armstrong number? on 23 Feb 2025 at 19:20
	Suraj submitted Solution 14557436 to Problem 2061. Narcissistic number ? on 23 Feb 2025 at 19:17
	Suraj submitted Solution 14557431 to Problem 1096. Largest Twin Primes on 23 Feb 2025 at 19:13
	Suraj submitted Solution 14557430 to Problem 896. Sophie Germain prime on 23 Feb 2025 at 19:12

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