Number theory

Community Group Solver

+50 points

Problem Title	Likes	Solvers
Problem 45272. Pseudo-vampire number Created by: Asif Newaz Tags numbers, number theory, sequence	1	11
Problem 45253. Pell numbers Created by: Asif Newaz Tags number, sequence, pell	1	29
Problem 45249. Frugal number Created by: Asif Newaz Tags number, frugal, economical	1	21
Problem 45250. Be happy Created by: Asif Newaz Tags number, happy	1	10
Problem 45229. Bell Triangle Created by: Asif Newaz Tags number, matrix, Magic Numbers	0	14
Problem 45223. find nth even fibonacci number Created by: Asif Newaz Tags series, number, fibonacci	1	23
Problem 45194. Cantor counting Created by: Asif Newaz Tags cantor, rational number	0	11
Problem 45192. check whether a number is a pentatope number Created by: Asif Newaz Tags pentatope	0	18
Problem 45191. generate nth pentatope number Created by: Asif Newaz Tags number, pentatope	0	21
Problem 1826. Find vampire numbers Created by: Andrew Newell Tags factors, number theory	9	156
Problem 1804. Fangs of a vampire number Created by: Andrew Newell Tags factors, number theory	3	66
Problem 1825. Find all vampire fangs Created by: Andrew Newell Tags factors, number theory	1	44
Problem 74. Balanced number Created by: Cody Team Tags matlab	14	2204
Problem 81. Mandelbrot Numbers Created by: Cody Team Tags matlab, fractals	5	637
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	3	270
Problem 165. Woodall number Created by: the cyclist Tags woodall number theory	1	144
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	2	270
Problem 235. Project Euler: Problem 4, Palindromic numbers Created by: Doug Hull Tags projecteuler	0	236
Problem 45274. Fangs of pseudo-vampire number Created by: Asif Newaz Tags number theory, vampire	0	9
Problem 249. Project Euler: Problem 9, Pythagorean numbers Created by: Doug Hull Tags projecteuler	4	268
Problem 525. Mersenne Primes Created by: Drew Weymouth Tags math, prime, integers	2	237
Problem 896. Sophie Germain prime Created by: Aurelien Queffurust Tags prime, primes, sophie germain	1	262
Problem 1008. Determine if input is a Narcissistic number Created by: Binbin Qi Tags mod floor	0	115
Problem 1012. Determine if input is a perfect number Created by: Binbin Qi Tags mod sum, perfect	0	152
Problem 933. Ordinal numbers Created by: Tim Tags ordinal, lookup table	1	139
Problem 1082. Lychrel Number Test (Inspired by Project Euler Problem 55) Created by: @bmtran (Bryant Tran) Tags projecteuler, plus15	1	73
Problem 1095. Circular Primes (based on Project Euler, problem 35) Created by: James Tags primes, projecteuler, circular reasoning	4	131
Problem 1096. Largest Twin Primes Created by: Des Mc Manus Tags primes	0	223
Problem 1190. Golomb's self-describing sequence (based on Euler 341) Created by: James Tags projecteuler, self-referential, golomb sequence	2	125
Problem 1407. Is it an Armstrong number? Created by: Harish Maradana Tags armstrong no	1	233
Problem 1477. Champernowne Constant Created by: G K Tags math	0	43
Problem 45251. Last non-zero digit Created by: Asif Newaz Tags number, factorial	0	18
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	2	96
Problem 1925. Smith numbers Created by: Sky Sartorius Tags sum, factors	4	260
Problem 2733. Evil Number Created by: Jan Orwat Tags easy, number theory, oeis	2	214
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	5	255
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	5	136
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags number theory, a138591	2	134
Problem 2061. Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	2	249
Problem 2056. Is this number Munchhausen Narcissistic? Created by: Ted Tags math, narcissistic number, munchhausen	2	147
Problem 1298. P-smooth numbers Created by: Richard Zapor Tags primes, find, mod	0	50
Problem 44836. Iccanobif numbers 1 Created by: James Tags fibonacci, iccanobif	1	37
Problem 44748. Amicable numbers Created by: cdeliu Tags number theory, divisors	1	34
Problem 44385. Extra safe primes Created by: Matthew Eicholtz Tags prime numbers, cody5, safe prime	9	930
Problem 44360. Pentagonal Numbers Created by: goc3 Tags series, number, sequence	6	739

Recent Group Finishers6

Recent Activity

	Athi submitted Solution 2775358 to Problem 45249. Frugal number on 4 Aug 2020 at 11:15
	Jean-Marie Sainthillier submitted Solution 2761570 to Problem 45229. Bell Triangle on 30 Jul 2020 at 22:54
	Jean-Marie Sainthillier submitted Solution 2761552 to Problem 45191. generate nth pentatope number on 30 Jul 2020 at 22:27
	Jean-Marie Sainthillier submitted Solution 2761531 to Problem 45192. check whether a number is a pentatope number on 30 Jul 2020 at 22:02
	Jean-Marie Sainthillier submitted Solution 2761393 to Problem 45249. Frugal number on 30 Jul 2020 at 21:20