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
"Nonabundant 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
"1000digit 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
"Doublebase 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
"Substring 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.
