# 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

42

#### Problem 45191. generate nth pentatope number

Created by: Asif Newaz

3

45

#### Problem 1407. Is it an Armstrong number?

Created by: Harish Maradana

3

279

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

Created by: Binbin Qi

Tags mod floor

2

166

#### Problem 44748. Amicable numbers

Created by: cdeliu

1

52

#### Problem 896. Sophie Germain prime

Created by: Aurelien Queffurust

3

462

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

Created by: Binbin Qi

2

188

#### Problem 2061. Narcissistic number ?

Created by: Jean-Marie Sainthillier

2

297

#### Problem 45253. Pell numbers

Created by: Asif Newaz

2

47

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

Created by: Asif Newaz

1

50

#### Problem 45250. Be happy

Created by: Asif Newaz

Tags number, happy

2

21

#### Problem 1298. P-smooth numbers

Created by: Richard Zapor

Tags primes, find, mod

1

75

#### Problem 2690. Armstrong Number

Created by: VIVEK RUHELA

7

274

#### Problem 156. Parasitic numbers

Created by: the cyclist

Tags parasitic

4

274

#### Problem 2733. Evil Number

Created by: Jan Orwat

3

233

#### Problem 44385. Extra safe primes

Created by: Matthew Eicholtz

11

706

#### Problem 44836. Iccanobif numbers 1

Created by: James

3

51

Created by: Ted

3

171

Created by: goc3

11

628

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

Created by: Andrew Newell

4

78

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

Created by: Jan Orwat

2

146

#### Problem 1096. Largest Twin Primes

Created by: Des Mc Manus

Tags primes

2

395

#### Problem 166. Kaprekar numbers

Created by: the cyclist

Tags kaprekar

4

259

#### Problem 165. Woodall number

Created by: the cyclist

1

148

#### Problem 45229. Bell Triangle

Created by: Asif Newaz

1

33

#### Problem 525. Mersenne Primes

Created by: Drew Weymouth

4

442

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

Created by: @bmtran (Bryant Tran)

1

79

#### Problem 45249. Frugal number

Created by: Asif Newaz

2

31

#### Problem 45194. Cantor counting

Created by: Asif Newaz

3

25

Created by: Tim

1

232

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

Created by: James

3

135

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

Created by: Jan Orwat

7

143

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

Created by: Doug Hull

6

810

Created by: G K

Tags math

2

65

#### Problem 1925. Smith numbers

Created by: Sky Sartorius

Tags sum, factors

4

487

#### Problem 1825. Find all vampire fangs

Created by: Andrew Newell

2

53

#### Problem 74. Balanced number

Created by: Cody Team

Tags matlab

20

2514

#### 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

293

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

Created by: Doug Hull

8

748

#### Problem 81. Mandelbrot Numbers

Created by: Cody Team

12

1262

#### Problem 45272. Pseudo-vampire number

Created by: Asif Newaz

2

18

#### Problem 1826. Find vampire numbers

Created by: Andrew Newell

11

282

#### Problem 1742. Generate a Parasitic Number

Created by: James

5

72

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

Created by: Asif Newaz

1

17

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