1.Multiples of 3 and 5
2.Even Fibonacci numbers
3.Largest prime factor
4.Largest palindrome product
5.Smallest multiple
6.Sum square difference
7.10001st prime
8.Largest product in a series
9.Special Pythagorean triplet
10.Summation of primes
11.Largest product in a grid
12.Highly divisible triangular number
13.Large sum
14.Longest Collatz sequence
15.Lattice paths
16.Power digit sum
17.Number letter counts
18.Maximum path sum I
19.Counting Sundays
20.Factorial digit sum
21.Amicable numbers
22.Names scores
23.Non-abundant sums
24.Lexicographic permutations
25.1000-digit Fibonacci number
26.Reciprocal cycles
27.Quadratic primes
28.Number spiral diagonals
29.Distinct powers
30.Digit fifth powers
31.Coin sums
32.Pandigital products
33.Digit canceling fractions
34.Digit factorials
35.Circular primes
36.Double-base palindromes
37.Truncatable primes
38.Pandigital multiples
39.Integer right triangles
40.Champernowne's constant
41.Pandigital prime
42.Coded triangle numbers
43.Sub-string divisibility
44.Pentagon numbers
45.Triangular, pentagonal, and hexagonal
46.Goldbach's other conjecture
47.Distinct primes factors
48.Self powers
49.Prime permutations
50.Consecutive prime sum
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
101.Optimum polynomial
102.Triangle containment
103.Special subset sums: optimum
104.Pandigital Fibonacci ends
105.Special subset sums: testing
106.Special subset sums: meta-testing
107.Minimal network
108.Diophantine reciprocals I
109.Darts
110.Diophantine reciprocals II
111.Primes with runs
112.Bouncy numbers
113.Non-bouncy numbers
114.Counting block combinations I
115.Counting block combinations II
116.Red, green or blue tiles
117.Red, green, and blue tiles
118.Pandigital prime sets
119.Digit power sum
120.Square remainders
121.Disc game prize fund
122.Efficient exponentiation
123.Prime square remainders
124.Ordered radicals
125.Palindromic sums
126.Cuboid layers
127.abc-hits
128.Hexagonal tile differences
129.Repunit divisibility
130.Composites with prime repunit property