# 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

36

#### Problem 45191. generate nth pentatope number

Created by: Asif Newaz

3

42

3

260

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

Created by: Binbin Qi

2

178

#### Problem 2061. Narcissistic number ?

Created by: Jean-Marie Sainthillier

2

280

#### Problem 44748. Amicable numbers

Created by: cdeliu

1

49

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

Created by: Binbin Qi

Tags mod floor

2

152

#### Problem 896. Sophie Germain prime

Created by: Aurelien Queffurust

3

455

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

Created by: Asif Newaz

1

48

#### Problem 45253. Pell numbers

Created by: Asif Newaz

2

45

#### 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

69

#### Problem 156. Parasitic numbers

Created by: the cyclist

Tags parasitic

4

268

#### Problem 2690. Armstrong Number

Created by: VIVEK RUHELA

7

276

#### Problem 44385. Extra safe primes

Created by: Matthew Eicholtz

11

698

#### Problem 44836. Iccanobif numbers 1

Created by: James

3

50

#### Problem 2733. Evil Number

Created by: Jan Orwat

3

227

#### Problem 1096. Largest Twin Primes

Created by: Des Mc Manus

Tags primes

2

388

#### Problem 45229. Bell Triangle

Created by: Asif Newaz

1

32

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

Created by: Jan Orwat

2

142

Created by: Ted

2

163

Created by: goc3

11

616

#### Problem 525. Mersenne Primes

Created by: Drew Weymouth

4

427

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

Created by: Andrew Newell

4

74

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

Created by: @bmtran (Bryant Tran)

1

73

#### Problem 166. Kaprekar numbers

Created by: the cyclist

Tags kaprekar

4

254

#### Problem 165. Woodall number

Created by: the cyclist

1

144

#### Problem 45194. Cantor counting

Created by: Asif Newaz

3

25

#### Problem 45249. Frugal number

Created by: Asif Newaz

2

30

Created by: Tim

1

156

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

Created by: Jan Orwat

7

139

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

Created by: James

3

131

Created by: G K

Tags math

2

61

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

Created by: Doug Hull

5

740

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

Created by: Asif Newaz

1

27

#### Problem 1925. Smith numbers

Created by: Sky Sartorius

Tags sum, factors

4

480

#### Problem 74. Balanced number

Created by: Cody Team

Tags matlab

19

2355

#### Problem 1825. Find all vampire fangs

Created by: Andrew Newell

2

52

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

Created by: James

7

288

#### Problem 45272. Pseudo-vampire number

Created by: Asif Newaz

2

19

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

Created by: Doug Hull

5

677

#### Problem 81. Mandelbrot Numbers

Created by: Cody Team

11

1102

#### Problem 1826. Find vampire numbers

Created by: Andrew Newell

11

277

#### Problem 1742. Generate a Parasitic Number

Created by: James

5

85

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

Created by: Asif Newaz

1

16

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