Number theory

 "its a very interesting number"

Community Group Solver

+50 points

Problem Title	Likes	Solvers
Problem 45272. Pseudo-vampire number Created by: Asif Newaz Tags vampire, number theory, numbers	1	6
Problem 45253. Pell numbers Created by: Asif Newaz Tags pell, number, sequence	1	15
Problem 45249. Frugal number Created by: Asif Newaz Tags number, frugal, economical	1	9
Problem 45250. Be happy Created by: Asif Newaz Tags number, happy	1	8
Problem 45229. Bell Triangle Created by: Asif Newaz Tags number, bell, matrix	0	10
Problem 45223. find nth even fibonacci number Created by: Asif Newaz Tags fibonacci, even, number	1	18
Problem 45194. Cantor counting Created by: Asif Newaz Tags cantor, rational number	0	9
Problem 45192. check whether a number is a pentatope number Created by: Asif Newaz Tags pentatope	0	12
Problem 45191. generate nth pentatope number Created by: Asif Newaz Tags pentatope, number	0	14
Problem 1826. Find vampire numbers Created by: Andrew Newell Tags number theory, factors	6	109
Problem 1804. Fangs of a vampire number Created by: Andrew Newell Tags number theory, factors	3	46
Problem 1825. Find all vampire fangs Created by: Andrew Newell Tags number theory, factors	1	31
Problem 74. Balanced number Created by: Cody Team Tags matlab	14	1638
Problem 81. Mandelbrot Numbers Created by: Cody Team Tags matlab, fractals	4	443
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	3	218
Problem 165. Woodall number Created by: the cyclist Tags woodall number theory	1	119
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	2	208
Problem 235. Project Euler: Problem 4, Palindromic numbers Created by: Doug Hull Tags projecteuler	0	133
Problem 45274. Fangs of pseudo-vampire number Created by: Asif Newaz Tags number theory, vampire	0	7
Problem 249. Project Euler: Problem 9, Pythagorean numbers Created by: Doug Hull Tags projecteuler	3	169
Problem 525. Mersenne Primes Created by: Drew Weymouth Tags prime number, prime, mersenne	1	164
Problem 896. Sophie Germain prime Created by: Aurelien Queffurust Tags prime, primes, sophie germain	0	201
Problem 1008. Determine if input is a Narcissistic number Created by: Binbin Qi Tags mod floor	0	101
Problem 1012. Determine if input is a perfect number Created by: Binbin Qi Tags mod sum, perfect	0	120
Problem 933. Ordinal numbers Created by: Tim Tags lookup table, ordinal	0	98
Problem 1082. Lychrel Number Test (Inspired by Project Euler Problem 55) Created by: @bmtran (Bryant Tran) Tags plus15, projecteuler	0	50
Problem 1095. Circular Primes (based on Project Euler, problem 35) Created by: James Tags projecteuler, primes, circular reasoning	3	89
Problem 1096. Largest Twin Primes Created by: Des Mc Manus Tags primes	0	156
Problem 1190. Golomb's self-describing sequence (based on Euler 341) Created by: James Tags projecteuler, self-referential, golomb sequence	2	91
Problem 1407. Is it an Armstrong number? Created by: Harish Maradana Tags armstrong no	1	189
Problem 1477. Champernowne Constant Created by: G K Tags math	0	33
Problem 45251. Last non-zero digit Created by: Asif Newaz Tags factorial, number	0	12
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	2	62
Problem 1925. Smith numbers Created by: Sky Sartorius Tags factors, sum	3	184
Problem 2733. Evil Number Created by: Jan Orwat Tags pop series, number theory, easy	2	179
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	3	197
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	5	101
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags a138591, number theory	2	113
Problem 2061. Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	2	209
Problem 2056. Is this number Munchhausen Narcissistic? Created by: Ted Tags math, narcissistic number, munchhausen	2	127
Problem 1298. P-smooth numbers Created by: Richard Zapor Tags primes, mod, find	0	40
Problem 44836. Iccanobif numbers 1 Created by: James Tags iccanobif, fibonacci	0	33
Problem 44748. Amicable numbers Created by: cdeliu Tags divisors, number theory	1	19
Problem 44385. Extra safe primes Created by: Matthew Eicholtz Tags prime numbers, safe prime, cody5	9	608
Problem 44360. Pentagonal Numbers Created by: goc3 Tags five, pentagon, pentagonal	5	514

Recent Group Finishers4

Recent Activity

	ChrisR submitted Solution 2181467 to Problem 1008. Determine if input is a Narcissistic number on 29 Mar 2020 at 23:55
	Berhem Gök submitted Solution 2178186 to Problem 1012. Determine if input is a perfect number on 27 Mar 2020 at 15:23
	Berhem Gök submitted Solution 2178085 to Problem 45223. find nth even fibonacci number on 27 Mar 2020 at 14:30
	Berhem Gök submitted Solution 2177867 to Problem 45253. Pell numbers on 27 Mar 2020 at 11:54
	Binbin Qi submitted Solution 2177282 to Problem 45274. Fangs of pseudo-vampire number on 27 Mar 2020 at 2:38