User:ProjectEuler

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Project Euler stores a set of mathematical or computational problems that may be easy or hard. There are currently 846 problems from Project Euler, where the last problem was solved by 172 people as of September 25, 07:16:42 UTC+0.

Problems overview

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

List of problems

ID title keywords
1 Multiples of 3 and 5 FizzBuzz
2 Even Fibonacci numbers Fibonacci
3 Largest prime factor Factorization, big constant
4 Largest palindrome product Palindrome[citation needed]
5 Smallest multiple
6 Sum square difference
7 10001st prime
8 Largest product in a series searching
9 Special Pythagorean triplet Pythagorean triplet
10 Summation of primes
11 Largest product in a grid
12 Highly divisible Factorization
13 Large sum
14 Longest Collatz sequence
15 Lattice paths Pascal's triangle
16 Power digit sum digit sum
17 Number letter counts English
18 Maximum path sum I dynamic programming
19 Counting Sundays calendar
20 Factorial digit sum digit sum
21 Amicable numbers
22 Names scores sorting
23 Non-abundant sums
24 Lexicographic permutations
25 1000-digit Fibonacci number Fibonacci
26 Reciprocal cycles Fermat pseudo-prime[citation needed]
27 Quadratic primes negative output
28 Number spiral diagonals number spiral

External resources