class |
PE0001 |
Solution for problem 1
"Multiples of 3 and 5"
completed on Tue, 7 Apr 2015, 23:11.
|
class |
PE0002 |
Solution for problem 2
"Even Fibonacci numbers"
completed on Tue, 7 Apr 2015, 23:38.
|
class |
PE0003 |
Solution for problem 3
"Largest prime factor"
completed on Tue, 8 Apr 2015, 00:23.
|
class |
PE0004 |
Solution for problem 4
"Largest palindrome product"
completed on Thu, 9 Apr 2015, 06:15.
|
class |
PE0005 |
Solution for problem 5
"Smallest multiple"
completed on Thu, 9 Apr 2015, 06:27.
|
class |
PE0006 |
Solution for problem 6
"Sum square difference"
completed on Thu, 9 Apr 2015, 13:23.
|
class |
PE0007 |
Solution for problem 7
"10001st prime"
completed on Thu, 9 Apr 2015, 23:34.
|
class |
PE0008 |
Solution for problem 8
"Largest product in a series"
completed on Fri, 10 Apr 2015, 09:07.
|
class |
PE0009 |
Solution for problem 9
"Special Pythagorean triplet"
completed on Fri, 10 Apr 2015, 14:50.
|
class |
PE0010 |
Solution for problem 10
"Summation of primes"
completed on Fri, 10 Apr 2015, 14:57.
|
class |
PE0011 |
Solution for problem 11
"Largest product in a grid"
completed on Mon, 20 Apr 2015, 12:17.
|
class |
PE0012 |
Solution for problem 12
"Highly divisible triangular number"
completed on Thu, 23 Apr 2015, 22:36.
|
class |
PE0013 |
Solution for problem 13
"Large sum"
completed on Fri, 24 Apr 2015, 20:39.
|
class |
PE0014 |
Solution for problem 14
"Longest Collatz sequence"
completed on Tue, 28 Apr 2015, 19:52.
|
class |
PE0015 |
Solution for problem 15
"Lattice paths"
completed on Wed, 29 Apr 2015, 13:10.
|
class |
PE0016 |
Solution for problem 16
"Power digit sum"
completed on Thu, 14 May 2015, 20:59.
|
class |
PE0017 |
Solution for problem 17
"Number letter counts"
completed on Sat, 16 May 2015, 06:13.
|
class |
PE0018 |
Solution for problem 18
"Maximum path sum I"
completed on Sat, 16 May 2015, 21:14.
|
class |
PE0019 |
Solution for problem 19
"Counting Sundays"
completed on Sat, 23 May 2015, 23:06.
|
class |
PE0020 |
Solution for problem 20
"Factorial digit sum"
completed on Sun, 24 May 2015, 05:55.
|
class |
PE0021 |
Solution for problem 21
"Amicable numbers"
completed on Sun, 24 May 2015, 06:32.
|
class |
PE0022 |
Solution for problem 22
"Names scores"
completed on Mon, 25 May 2015, 06:49.
|
class |
PE0023 |
Solution for problem 23
"Non-abundant sums"
completed on Mon, 25 May 2015, 13:46.
|
class |
PE0024 |
Solution for problem 24
"Lexicographic permutations"
completed on Mon, 29 Jun 2015, 19:46.
|
class |
PE0025 |
Solution for problem 25
"1000-digit Fibonacci number"
completed on Sun, 19 Jul 2015, 06:25.
|
class |
PE0026 |
Solution for problem 26
"Reciprocal cycles"
completed on Sun, 19 Jul 2015, 13:33.
|
class |
PE0027 |
Solution for problem 27
"Quadratic primes"
completed on Thu, 23 Jul 2015, 23:58.
|
class |
PE0028 |
Solution for problem 28
"Number spiral diagonals"
completed on Thu, 8 Oct 2015, 19:28.
|
class |
PE0029 |
Solution for problem 29
"Distinct powers"
completed on Wed, 18 Nov 2015, 10:20.
|
class |
PE0030 |
Solution for problem 30
"Digit fifth powers"
completed on Fri, 11 Dec 2015, 23:34
|
class |
PE0031 |
Solution for problem 31
"Coin sums"
completed on Sat, 19 Dec 2015, 22:30.
|
class |
PE0032 |
Solution for problem 32
"Pandigital products"
completed on Sat, 26 Dec 2015, 14:24.
|
class |
PE0033 |
Solution for problem 33
"Digit cancelling fractions"
completed on Fri, 1 Jan 2016, 15:20.
|
class |
PE0034 |
Solution for problem 34
"Digit factorials"
completed on Sat, 2 Jan 2016, 00:31.
|
class |
PE0035 |
Solution for problem 35
"Circular primes"
completed on Thu, 4 Feb 2016, 21:22.
|
class |
PE0036 |
Solution for problem 36
"Double-base palindromes"
completed on Sat, 12 Mar 2016, 07:12.
|
class |
PE0037 |
Solution for problem 37
"Truncatable primes"
completed on Mon, 14 Mar 2016, 20:06.
|
class |
PE0038 |
Solution for problem 38
"Pandigital multiples"
completed on Sun, 20 Mar 2016, 18:44.
|
class |
PE0039 |
Solution for problem 39
"Integer right triangles"
completed on Fri, 25 Mar 2016, 11:04.
|
class |
PE0040 |
Solution for problem 40
"Champernowne's constant"
completed on Wed, 4 May 2016, 22:40.
|
class |
PE0041 |
Solution for problem 41
"Pandigital prime"
completed on Thu, 5 May 2016, 11:05.
|
class |
PE0042 |
Solution for problem 42
"Coded triangle numbers"
completed on Fri, 6 May 2016, 14:03.
|
class |
PE0043 |
Solution for problem 43
"Sub-string divisibility"
completed on Thu, 19 May 2016, 20:14.
|
class |
PE0044 |
Solution for problem 44
"Pentagon numbers"
completed on Fri, 20 May 2016, 19:33.
|
class |
PE0045 |
Solution for problem 45
"Triangular, pentagonal, and hexagonal"
completed on Sun, 22 May 2016, 13:54.
|
class |
PE0046 |
Solution for problem 46
"Goldbach's other conjecture"
completed on Sun, 29 May 2016, 07:28.
|
class |
PE0047 |
Solution for problem 47
"Distinct primes factors"
completed on Sun, 29 May 2016, 10:44.
|
class |
PE0048 |
Solution for problem 48
"Self powers"
completed on Sun, 12 Jun 2016, 18:19.
|
class |
PE0049 |
Solution for problem 49
"Prime permutations"
completed on Sat, 25 Jun 2016, 14:18.
|
class |
PE0050 |
Solution for problem 50
"Consecutive prime sum"
completed on Sat, 25 Jun 2016, 19:58
|
class |
PE0051 |
Solution for problem 51
"Prime digit replacements"
completed on Sun, 14 Aug 2016, 18:09.
|
class |
PE0052 |
Solution for problem 52
"Permuted multiples"
completed on Sun, 14 Aug 2016, 20:18.
|
class |
PE0053 |
Solution for problem 53
"Combinatoric selections"
completed on Tue, 16 Aug 2016, 17:43.
|
class |
PE0054 |
Solution for problem 54
"Poker hands"
completed on Sun, 21 Aug 2016, 14:02.
|
class |
PE0055 |
Solution for problem 55
"Lychrel numbers"
completed on Mon, 29 Aug 2016, 19:53.
|
class |
PE0056 |
Solution for problem 56
"Powerful digit sum"
completed on Wed, 26 Oct 2016, 00:43.
|
class |
PE0057 |
Solution for problem 57
"Square root convergents"
completed on Sun, 30 Oct 2016, 06:46.
|
class |
PE0058 |
Solution for problem 58
"Spiral primes"
completed on Sat, 10 Dec 2016, 07:47.
|
class |
PE0059 |
Solution for problem 59
"XOR decryption"
completed on Fri, 16 Dec 2016, 07:28.
|
class |
PE0060 |
Solution for problem 60
"Prime pair sets"
completed on Tue, 1 May 2018, 13:41.
|
class |
PE0061 |
Solution for problem 61
"Cyclical figurate numbers"
completed on Thu, 21 Mar 2019, 22:49.
|
class |
PE0062 |
Solution for problem 62
"Cubic permutations"
completed on Fri, 29 Mar 2019, 21:58.
|
class |
PE0063 |
Solution for problem 63
"Powerful digit counts"
completed on Fri, 29 Mar 2019, 23:43.
|
class |
PE0064 |
Solution for problem 64
"Odd period square roots"
completed on Sat, 4 Jan 2020, 22:03.
|
class |
PE0067 |
Solution for problem 67
"Maximum path sum II"
completed on Sat, 16 May 2015, 21:19.
|