# Problems

1 – 45 of 45
 Problem Title Likes Solvers Difficulty

#### Problem 45192. check whether a number is a pentatope number

Created by: Asif Newaz

Tags pentatope

1

49

#### Problem 45191. generate nth pentatope number

Created by: Asif Newaz

3

52

#### Problem 1008. Determine if input is a Narcissistic number

Created by: Binbin Qi

Tags mod floor

2

177

3

299

#### Problem 44748. Amicable numbers

Created by: vandeleeuw

1

58

#### Problem 45253. Pell numbers

Created by: Asif Newaz

2

54

#### Problem 1012. Determine if input is a perfect number

Created by: Binbin Qi

3

208

#### Problem 2061. Narcissistic number ?

Created by: Jean-Marie Sainthillier

2

309

#### Problem 45223. find nth even fibonacci number

Created by: Asif Newaz

2

58

#### Problem 1298. P-smooth numbers

Created by: Richard Zapor

Tags primes, find, mod

1

79

#### Problem 156. Parasitic numbers

Created by: the cyclist

Tags parasitic

4

283

#### Problem 2690. Armstrong Number

Created by: VIVEK RUHELA

8

291

#### Problem 44385. Extra safe primes

Created by: Matthew Eicholtz

11

723

#### Problem 2733. Evil Number

Created by: Jan Orwat

3

244

Created by: Ted

3

185

Created by: goc3

11

637

#### Problem 44836. Iccanobif numbers 1

Created by: James

3

55

#### Problem 45229. Bell Triangle

Created by: Asif Newaz

1

37

#### Problem 896. Sophie Germain prime

Created by: Aurelien Queffurust

3

636

#### Problem 2593. Polite numbers. N-th polite number.

Created by: Jan Orwat

2

152

#### Problem 166. Kaprekar numbers

Created by: the cyclist

Tags kaprekar

4

267

#### Problem 165. Woodall number

Created by: the cyclist

1

151

#### Problem 1804. Fangs of a vampire number

Created by: Andrew Newell

4

83

#### Problem 45250. Be happy

Created by: Asif Newaz

Tags number, happy

2

28

#### Problem 45249. Frugal number

Created by: Asif Newaz

2

36

#### Problem 45194. Cantor counting

Created by: Asif Newaz

3

28

#### Problem 1082. Lychrel Number Test (Inspired by Project Euler Problem 55)

Created by: @bmtran (Bryant Tran)

1

88

#### Problem 1096. Largest Twin Primes

Created by: Des Mc Manus

Tags primes

3

574

#### Problem 525. Mersenne Primes

Created by: Drew Weymouth

4

613

Created by: Tim

1

239

#### Problem 1190. Golomb's self-describing sequence (based on Euler 341)

Created by: James

3

145

#### Problem 2595. Polite numbers. Politeness.

Created by: Jan Orwat

7

160

Created by: G K

Tags math

2

71

#### Problem 249. Project Euler: Problem 9, Pythagorean numbers

Created by: Doug Hull

10

996

#### Problem 1925. Smith numbers

Created by: Sky Sartorius

Tags sum, factors

4

521

#### Problem 1825. Find all vampire fangs

Created by: Andrew Newell

2

55

#### Problem 74. Balanced number

Created by: Cody Team

Tags matlab

21

2732

#### Problem 45251. Last non-zero digit

Created by: Asif Newaz

1

28

#### Problem 235. Project Euler: Problem 4, Palindromic numbers

Created by: Doug Hull

10

913

#### Problem 1095. Circular Primes (based on Project Euler, problem 35)

Created by: James

8

436

#### Problem 45272. Pseudo-vampire number

Created by: Asif Newaz

2

22

#### Problem 81. Mandelbrot Numbers

Created by: Cody Team

13

1478

#### Problem 1826. Find vampire numbers

Created by: Andrew Newell

11

299

#### Problem 1742. Generate a Parasitic Number

Created by: James

6

79

#### Problem 45274. Fangs of pseudo-vampire number

Created by: Asif Newaz

1

19

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