Cody

Problems

1 – 16 of 16
Problem Title
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Solvers
Difficulty

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

65

Problem 2319. Pandigital number n°1 (Inspired by Project Euler 32)

Created by: Jean-Marie Sainthillier

Tags project euler, pandigital number

1

62

Problem 2051. is the number happy?

Created by: Ted

Tags math, happy number

0

50

Problem 1477. Champernowne Constant

Created by: G K

Tags math

2

50

Problem 2492. Factorions: Numbers that equal the sum of the factorials of their digits

Created by: Peter Cook

Tags factorial, factorion

2

48

Problem 2491. Dudeney Numbers: Numbers which are the cube of their decimal sum

Created by: Peter Cook

Tags cube, a061209, dudeney

1

47

Problem 1825. Find all vampire fangs

Created by: Andrew Newell

Tags factors, number theory

2

47

Problem 2320. Pandigital number n°2 (Inspired by Project Euler 32)

Created by: Jean-Marie Sainthillier

Tags project euler, pandigital number

2

41

Problem 2721. Pandigital Factors (Based on Euler 491)

Created by: James

Tags projecteuler, pandigital

2

27

Problem 2323. Pandigital number n°3 (Inspired by Project Euler 32)

Created by: Jean-Marie Sainthillier

Tags project euler, pandigital number

1

27

Problem 1394. Prime Ladders

Created by: Ned Gulley

Tags primes

7

25

Problem 1673. Pandiagonal Prime Magic Square Verification

Created by: Richard Zapor

Tags prime, magic square, pandiagonal

0

18

Problem 1672. Leftovers? Again?!

Created by: James

Tags leftovers, modulo

2

16

Problem 2838. Optimum Egyptian Fractions

Created by: Jan Orwat

Tags recursion, optimization, egyptian fraction

0

11

Problem 1697. Make a Pandiagonal Prime Magic Square: 11 x 11

Created by: Richard Zapor

Tags primes, magic square, pandiagonal

1

8
1 – 16 of 16