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Problems


ID Description / Title
51
 Prime digit replacements
52
 Permuted multiples
53
 Combinatoric selections
54
 Poker hands
55
 Lychrel numbers
56
 Powerful digit sum
57
 Square root convergents
58
 Spiral primes
59
 XOR decryption
60
 Prime pair sets
61
 Cyclical figurate numbers
62
 Cubic permutations
63
 Powerful digit counts
64
 Odd period square roots
65
 Convergents of e
66
 Diophantine equation
67
 Maximum path sum II
68
 Magic 5-gon ring
69
 Totient maximum
70
 Totient permutation
71
 Ordered fractions
72
 Counting fractions
73
 Counting fractions in a range
74
 Digit factorial chains
75
 Singular integer right triangles
76
 Counting summations
77
 Prime summations
78
 Coin partitions
79
 Passcode derivation
80
 Square root digital expansion
81
 Path sum: two ways
82
 Path sum: three ways
83
 Path sum: four ways
84
 Monopoly odds
85
 Counting rectangles
86
 Cuboid route
87
 Prime power triples
88
 Product-sum numbers
89
 Roman numerals
90
 Cube digit pairs
91
 Right triangles with integer coordinates
92
 Square digit chains
93
 Arithmetic expressions
94
 Almost equilateral triangles
95
 Amicable chains
96
 Su Doku
97
 Large non-Mersenne prime
98
 Anagramic squares
99
 Largest exponential
100
 Arranged probability