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Problems


IDDescription / TitleSolved By
51Prime digit replacements
16379
52Permuted multiples
35756
53Combinatoric selections
32488
54Poker hands
18010
55Lychrel numbers
29244
56Powerful digit sum
31516
57Square root convergents
21469
58Spiral primes
20883
59XOR decryption
22471
60Prime pair sets
12977
61Cyclical figurate numbers
12973
62Cubic permutations
16009
63Powerful digit counts
22893
64Odd period square roots
11386
65Convergents of e
15897
66Diophantine equation
10077
67Maximum path sum II
53095
68Magic 5-gon ring
10686
69Totient maximum
18266
70Totient permutation
11858
71Ordered fractions
15299
72Counting fractions
11810
73Counting fractions in a range
13923
74Digit factorial chains
14242
75Singular integer right triangles
9300
76Counting summations
15402
77Prime summations
9796
78Coin partitions
8574
79Passcode derivation
25305
80Square root digital expansion
10520
81Path sum: two ways
18805
82Path sum: three ways
11301
83Path sum: four ways
9573
84Monopoly odds
6452
85Counting rectangles
13362
86Cuboid route
6570
87Prime power triples
11086
88Product-sum numbers
4836
89Roman numerals
11882
90Cube digit pairs
5621
91Right triangles with integer coordinates
8215
92Square digit chains
22680
93Arithmetic expressions
5919
94Almost equilateral triangles
6179
95Amicable chains
7328
96Su Doku
8899
97Large non-Mersenne prime
26485
98Anagramic squares
5667
99Largest exponential
16583
100Arranged probability
8312