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	2	16
Problem 45253. Pell numbers Created by: Asif Newaz Tags number, sequence, pell	2	34
Problem 45249. Frugal number Created by: Asif Newaz Tags number, frugal, economical	2	26
Problem 45250. Be happy Created by: Asif Newaz Tags number, happy	2	17
Problem 45229. Bell Triangle Created by: Asif Newaz Tags number, matrix, Magic Numbers	1	25
Problem 45223. find nth even fibonacci number Created by: Asif Newaz Tags series, number, fibonacci	1	33
Problem 45194. Cantor counting Created by: Asif Newaz Tags cantor, rational number	1	17
Problem 45192. check whether a number is a pentatope number Created by: Asif Newaz Tags pentatope	1	26
Problem 45191. generate nth pentatope number Created by: Asif Newaz Tags number, pentatope	2	31
Problem 1826. Find vampire numbers Created by: Andrew Newell Tags factors, number theory	9	149
Problem 1804. Fangs of a vampire number Created by: Andrew Newell Tags factors, number theory	4	62
Problem 1825. Find all vampire fangs Created by: Andrew Newell Tags factors, number theory	2	44
Problem 74. Balanced number Created by: Cody Team Tags matlab	15	1912
Problem 81. Mandelbrot Numbers Created by: Cody Team Tags matlab, fractals	7	642
Problem 156. Parasitic numbers Created by: the cyclist Tags parasitic	4	251
Problem 165. Woodall number Created by: the cyclist Tags woodall number theory	1	136
Problem 166. Kaprekar numbers Created by: the cyclist Tags kaprekar	4	236
Problem 235. Project Euler: Problem 4, Palindromic numbers Created by: Doug Hull Tags projecteuler	3	256
Problem 45274. Fangs of pseudo-vampire number Created by: Asif Newaz Tags number theory, vampire	1	13
Problem 249. Project Euler: Problem 9, Pythagorean numbers Created by: Doug Hull Tags projecteuler	4	292
Problem 525. Mersenne Primes Created by: Drew Weymouth Tags math, prime, integers	3	236
Problem 896. Sophie Germain prime Created by: Aurelien Queffurust Tags prime, primes, sophie germain	2	279
Problem 1008. Determine if input is a Narcissistic number Created by: Binbin Qi Tags mod floor	0	122
Problem 1012. Determine if input is a perfect number Created by: Binbin Qi Tags mod sum, perfect	0	147
Problem 933. Ordinal numbers Created by: Tim Tags ordinal, lookup table	1	123
Problem 1082. Lychrel Number Test (Inspired by Project Euler Problem 55) Created by: @bmtran (Bryant Tran) Tags projecteuler, plus15	1	60
Problem 1095. Circular Primes (based on Project Euler, problem 35) Created by: James Tags primes, projecteuler, circular reasoning	6	145
Problem 1096. Largest Twin Primes Created by: Des Mc Manus Tags primes	1	220
Problem 1190. Golomb's self-describing sequence (based on Euler 341) Created by: James Tags projecteuler, self-referential, golomb sequence	3	108
Problem 1407. Is it an Armstrong number? Created by: Harish Maradana Tags armstrong no	1	228
Problem 1477. Champernowne Constant Created by: G K Tags math	2	47
Problem 45251. Last non-zero digit Created by: Asif Newaz Tags number, factorial	1	23
Problem 1742. Generate a Parasitic Number Created by: James Tags parasitic, cyclic	4	75
Problem 1925. Smith numbers Created by: Sky Sartorius Tags sum, factors	4	244
Problem 2733. Evil Number Created by: Jan Orwat Tags easy, number theory, oeis	3	207
Problem 2690. Armstrong Number Created by: VIVEK RUHELA Tags arithmetic, basic matlab	6	253
Problem 2595. Polite numbers. Politeness. Created by: Jan Orwat Tags number theory, oeis	6	120
Problem 2593. Polite numbers. N-th polite number. Created by: Jan Orwat Tags number theory, a138591	2	128
Problem 2061. Narcissistic number ? Created by: Jean-Marie Sainthillier Tags narcissistic	2	250
Problem 2056. Is this number Munchhausen Narcissistic? Created by: Ted Tags math, narcissistic number, munchhausen	2	142
Problem 1298. P-smooth numbers Created by: Richard Zapor Tags primes, find, mod	1	54
Problem 44836. Iccanobif numbers 1 Created by: James Tags fibonacci, iccanobif	3	43
Problem 44748. Amicable numbers Created by: cdeliu Tags number theory, divisors	1	36
Problem 44385. Extra safe primes Created by: Matthew Eicholtz Tags prime numbers, cody5, safe prime	10	666
Problem 44360. Pentagonal Numbers Created by: goc3 Tags series, number, sequence	9	572

Recent Group Finishers11

Recent Activity

	Nikolaos Nikolaou submitted Solution 4793717 to Problem 1825. Find all vampire fangs on 10 Feb 2021 at 21:48
	Nikolaos Nikolaou submitted Solution 4790772 to Problem 45272. Pseudo-vampire number on 10 Feb 2021 at 16:12
	Paul Morant submitted Solution 4714588 to Problem 165. Woodall number on 1 Feb 2021 at 15:19
	pign_an submitted Solution 4623604 to Problem 44748. Amicable numbers on 19 Jan 2021
	pign_an submitted Solution 4623604 to Problem 44748. Amicable numbers on 19 Jan 2021

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