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Problems Archives

The problems archives table shows problems 1 to 746. 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
33595
52Permuted multiples
65079
53Combinatoric selections
58803
54Poker hands
35868
55Lychrel numbers
53644
56Powerful digit sum
58046
57Square root convergents
41394
58Spiral primes
39961
59XOR decryption
41002
60Prime pair sets
26398
61Cyclical figurate numbers
25181
62Cubic permutations
31149
63Powerful digit counts
42953
64Odd period square roots
21849
65Convergents of e
29580
66Diophantine equation
19374
67Maximum path sum II
95787
68Magic 5-gon ring
20457
69Totient maximum
34469
70Totient permutation
21963
71Ordered fractions
28981
72Counting fractions
22037
73Counting fractions in a range
24737
74Digit factorial chains
26434
75Singular integer right triangles
17683
76Counting summations
28293
77Prime summations
18854
78Coin partitions
16546
79Passcode derivation
40733
80Square root digital expansion
19535
81Path sum: two ways
33988
82Path sum: three ways
20780
83Path sum: four ways
17814
84Monopoly odds
12331
85Counting rectangles
24344
86Cuboid route
12420
87Prime power triples
20568
88Product-sum numbers
9807
89Roman numerals
20874
90Cube digit pairs
10962
91Right triangles with integer coordinates
15135
92Square digit chains
41266
93Arithmetic expressions
11482
94Almost equilateral triangles
12022
95Amicable chains
13950
96Su Doku
16812
97Large non-Mersenne prime
42900
98Anagramic squares
11071
99Largest exponential
30202
100Arranged probability
15950