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Problems


IDDescription / TitleSolved By
51Prime digit replacements
15670
52Permuted multiples
34487
53Combinatoric selections
31334
54Poker hands
17290
55Lychrel numbers
28159
56Powerful digit sum
30273
57Square root convergents
20627
58Spiral primes
20071
59XOR decryption
21643
60Prime pair sets
12430
61Cyclical figurate numbers
12466
62Cubic permutations
15393
63Powerful digit counts
22100
64Odd period square roots
10970
65Convergents of e
15258
66Diophantine equation
9704
67Maximum path sum II
51071
68Magic 5-gon ring
10276
69Totient maximum
17685
70Totient permutation
11451
71Ordered fractions
14823
72Counting fractions
11390
73Counting fractions in a range
13501
74Digit factorial chains
13743
75Singular integer right triangles
8967
76Counting summations
14917
77Prime summations
9434
78Coin partitions
8261
79Passcode derivation
24635
80Square root digital expansion
10128
81Path sum: two ways
18081
82Path sum: three ways
10875
83Path sum: four ways
9199
84Monopoly odds
6210
85Counting rectangles
12893
86Cuboid route
6363
87Prime power triples
10678
88Product-sum numbers
4662
89Roman numerals
11412
90Cube digit pairs
5419
91Right triangles with integer coordinates
7932
92Square digit chains
21784
93Arithmetic expressions
5703
94Almost equilateral triangles
5974
95Amicable chains
7064
96Su Doku
8563
97Large non-Mersenne prime
25834
98Anagramic squares
5460
99Largest exponential
16019
100Arranged probability
7964