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	30
Problem 45253. Pell numbers Created by: Asif Newaz Tags number, sequence, pell	2	76
Problem 45249. Frugal number Created by: Asif Newaz Tags number, frugal, economical	2	49
Problem 45250. Be happy Created by: Asif Newaz Tags number, happy	3	33
Problem 45229. Bell Triangle Created by: Asif Newaz Tags number, matrix, Magic Numbers	2	52
Problem 45223. find nth even fibonacci number Created by: Asif Newaz Tags series, number, fibonacci	2	81
Problem 45194. Cantor counting Created by: Asif Newaz Tags cantor, rational number	4	36
Problem 45192. check whether a number is a pentatope number Created by: Asif Newaz Tags pentatope	2	65
Problem 45191. generate nth pentatope number Created by: Asif Newaz Tags number, pentatope	4	69
Problem 1804. Fangs of a vampire number Created by: Andrew Newell Tags factors, number theory	5	104
Problem 1825. Find all vampire fangs Created by: Andrew Newell Tags factors, number theory	2	75
Problem 74. Balanced number Created by: Cody Team Tags matlab	22	3071
Problem 81. Mandelbrot Numbers Created by: Cody Team Tags matlab, fractals	16	1773
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	4	309
Problem 165. Woodall number Created by: the cyclist Tags woodall number theory	2	170
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	5	288
Problem 235. Project Euler: Problem 4, Palindromic numbers Created by: Doug Hull Tags projecteuler	13	1248
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	1414
Problem 525. Mersenne Primes Created by: Drew Weymouth Tags math, prime, integers	7	960
Problem 896. Sophie Germain prime Created by: Aurelien Queffurust Tags prime, primes, sophie germain	6	1055
Problem 1008. Determine if input is a Narcissistic number Created by: Binbin Qi Tags mod floor	2	211
Problem 1012. Determine if input is a perfect number Created by: Binbin Qi Tags mod sum, perfect	4	254
Problem 933. Ordinal numbers Created by: Tim Tags ordinal, lookup table	2	266
Problem 1082. Lychrel Number Test (Inspired by Project Euler Problem 55) Created by: @bmtran (Bryant Tran) Tags projecteuler, plus15	1	108
Problem 1095. Circular Primes (based on Project Euler, problem 35) Created by: James Tags primes, projecteuler, circular reasoning	10	643
Problem 1096. Largest Twin Primes Created by: Des Mc Manus Tags primes	5	980
Problem 1190. Golomb's self-describing sequence (based on Euler 341) Created by: James Tags projecteuler, self-referential, golomb sequence	3	176
Problem 1407. Is it an Armstrong number? Created by: Harish Maradana Tags armstrong no	3	343
Problem 1477. Champernowne Constant Created by: G K Tags math	3	91
Problem 45251. Last non-zero digit Created by: Asif Newaz Tags number, factorial	1	38
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	7	91
Problem 1925. Smith numbers Created by: Sky Sartorius Tags sum, factors	6	772
Problem 2733. Evil Number Created by: Jan Orwat Tags easy, number theory, oeis	3	268
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	8	349
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	8	180
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags number theory, a138591	2	162
Problem 2061. Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	4	342
Problem 2056. Is this number Munchhausen? Created by: Ted Tags math, narcissistic number, munchhausen	3	205
Problem 1298. P-smooth numbers Created by: Richard Zapor Tags primes, find, mod	1	93
Problem 44836. Iccanobif numbers 1 Created by: James Tags fibonacci, iccanobif	3	64
Problem 44748. Amicable numbers Created by: vandeleeuw Tags number theory, divisors	3	76
Problem 44385. Extra safe primes Created by: Matthew Eicholtz Tags prime numbers, cody5, safe prime	13	752
Problem 44360. Pentagonal Numbers Created by: goc3 Tags series, number, sequence	12	668

Recent Group Finishers20

Recent Activity

	ROBERTO submitted Solution 14899072 to Problem 166. Kaprekar numbers on 30 Nov 2025 at 20:42
	ROBERTO submitted Solution 14894611 to Problem 1804. Fangs of a vampire number on 28 Nov 2025 at 10:45
	Armando Longobardi submitted Solution 14893619 to Problem 45250. Be happy on 27 Nov 2025 at 16:13
	Armando Longobardi submitted Solution 14893588 to Problem 45253. Pell numbers on 27 Nov 2025 at 15:45
	Khiêm submitted Solution 14867908 to Problem 1407. Is it an Armstrong number? on 15 Nov 2025 at 4:01

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