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Problems Archives

The problems archives table shows problems 1 to 739. 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
33369
52Permuted multiples
64759
53Combinatoric selections
58495
54Poker hands
35638
55Lychrel numbers
53345
56Powerful digit sum
57750
57Square root convergents
41125
58Spiral primes
39714
59XOR decryption
40764
60Prime pair sets
26204
61Cyclical figurate numbers
25009
62Cubic permutations
30943
63Powerful digit counts
42718
64Odd period square roots
21701
65Convergents of e
29395
66Diophantine equation
19227
67Maximum path sum II
95443
68Magic 5-gon ring
20319
69Totient maximum
34257
70Totient permutation
21820
71Ordered fractions
28808
72Counting fractions
21897
73Counting fractions in a range
24588
74Digit factorial chains
26267
75Singular integer right triangles
17542
76Counting summations
28112
77Prime summations
18714
78Coin partitions
16407
79Passcode derivation
40546
80Square root digital expansion
19401
81Path sum: two ways
33810
82Path sum: three ways
20653
83Path sum: four ways
17705
84Monopoly odds
12233
85Counting rectangles
24201
86Cuboid route
12328
87Prime power triples
20437
88Product-sum numbers
9727
89Roman numerals
20760
90Cube digit pairs
10883
91Right triangles with integer coordinates
15029
92Square digit chains
41052
93Arithmetic expressions
11409
94Almost equilateral triangles
11942
95Amicable chains
13862
96Su Doku
16689
97Large non-Mersenne prime
42705
98Anagramic squares
10999
99Largest exponential
30037
100Arranged probability
15847