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Problems Archives

  • Problem 727 will be accessible in 9 hours, 4 minutes (Saturday, 26th September 2020, 11:00 pm)

The problems archives table shows problems 1 to 716. If you would like to tackle the 10 most recently published problems then go to Recent problems.
Click the description/title of the problem to view details and submit your answer.


ID

Description / TitleSolved By
51Prime digit replacements
32761
52Permuted multiples
63962
53Combinatoric selections
57758
54Poker hands
35029
55Lychrel numbers
52618
56Powerful digit sum
57030
57Square root convergents
40446
58Spiral primes
39050
59XOR decryption
40149
60Prime pair sets
25665
61Cyclical figurate numbers
24516
62Cubic permutations
30364
63Powerful digit counts
42058
64Odd period square roots
21259
65Convergents of e
28927
66Diophantine equation
18830
67Maximum path sum II
94462
68Magic 5-gon ring
19924
69Totient maximum
33670
70Totient permutation
21397
71Ordered fractions
28325
72Counting fractions
21493
73Counting fractions in a range
24167
74Digit factorial chains
25811
75Singular integer right triangles
17197
76Counting summations
27659
77Prime summations
18354
78Coin partitions
16074
79Passcode derivation
40013
80Square root digital expansion
19057
81Path sum: two ways
33325
82Path sum: three ways
20311
83Path sum: four ways
17385
84Monopoly odds
11989
85Counting rectangles
23796
86Cuboid route
12052
87Prime power triples
20077
88Product-sum numbers
9496
89Roman numerals
20436
90Cube digit pairs
10623
91Right triangles with integer coordinates
14747
92Square digit chains
40464
93Arithmetic expressions
11138
94Almost equilateral triangles
11660
95Amicable chains
13573
96Su Doku
16345
97Large non-Mersenne prime
42206
98Anagramic squares
10730
99Largest exponential
29551
100Arranged probability
15519