# 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

43

#### Problem 45191. generate nth pentatope number

Created by: Asif Newaz

3

47

3

286

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

Created by: Binbin Qi

Tags mod floor

2

169

#### Problem 44748. Amicable numbers

Created by: cdeliu

1

56

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

Created by: Binbin Qi

2

191

#### Problem 896. Sophie Germain prime

Created by: Aurelien Queffurust

3

468

#### Problem 2061. Narcissistic number ?

Created by: Jean-Marie Sainthillier

2

298

#### Problem 45253. Pell numbers

Created by: Asif Newaz

2

47

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

Created by: Asif Newaz

1

52

#### Problem 45250. Be happy

Created by: Asif Newaz

Tags number, happy

2

23

#### Problem 1298. P-smooth numbers

Created by: Richard Zapor

Tags primes, find, mod

1

75

#### Problem 156. Parasitic numbers

Created by: the cyclist

Tags parasitic

4

275

#### Problem 2690. Armstrong Number

Created by: VIVEK RUHELA

7

279

#### Problem 44385. Extra safe primes

Created by: Matthew Eicholtz

11

708

#### Problem 44836. Iccanobif numbers 1

Created by: James

3

54

#### Problem 2733. Evil Number

Created by: Jan Orwat

3

235

Created by: Ted

3

175

Created by: goc3

11

630

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

Created by: Jan Orwat

2

147

#### Problem 1096. Largest Twin Primes

Created by: Des Mc Manus

Tags primes

2

400

#### Problem 165. Woodall number

Created by: the cyclist

1

148

#### Problem 166. Kaprekar numbers

Created by: the cyclist

Tags kaprekar

4

262

#### Problem 45229. Bell Triangle

Created by: Asif Newaz

1

33

#### Problem 525. Mersenne Primes

Created by: Drew Weymouth

4

448

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

Created by: Andrew Newell

4

78

#### Problem 45249. Frugal number

Created by: Asif Newaz

2

32

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

Created by: @bmtran (Bryant Tran)

1

80

#### Problem 45194. Cantor counting

Created by: Asif Newaz

3

25

Created by: Tim

1

234

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

Created by: James

3

139

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

Created by: Jan Orwat

7

145

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

Created by: Doug Hull

6

824

Created by: G K

Tags math

2

65

#### Problem 1925. Smith numbers

Created by: Sky Sartorius

Tags sum, factors

4

489

#### Problem 1825. Find all vampire fangs

Created by: Andrew Newell

2

53

#### Problem 74. Balanced number

Created by: Cody Team

Tags matlab

21

2540

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

Created by: Asif Newaz

1

27

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

Created by: James

7

296

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

Created by: Doug Hull

8

760

#### Problem 81. Mandelbrot Numbers

Created by: Cody Team

13

1288

#### Problem 45272. Pseudo-vampire number

Created by: Asif Newaz

2

18

#### Problem 1826. Find vampire numbers

Created by: Andrew Newell

11

283

#### Problem 1742. Generate a Parasitic Number

Created by: James

6

73

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

Created by: Asif Newaz

1

17

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