Unsolved Mathematical Problems

Unsolved Problems

2	Graph Spectrum	Prime Array
A-Sequence	Grimm's Conjecture	Prime Gaps
abc Conjecture	Guy's Conjecture	Prime Power Conjecture
Ablowitz-Ramani-Segur...	H^*-Connected Graph	Projective Plane
Agoh's Conjecture	Hadamard Matrix	Quasiperfect Number
Aliquot Sequence	Hadwiger-Nelson Problem	Quillen-Lichtenbaum Co...
Almost Perfect Number	Halting Problem	Rabin-Miller Strong Ps...
Alon-Tarsi Conjecture	Hamilton Decomposition	Ramanujan-Petersson Co...
Alternating Series	Happy End Problem	Random Close Packing
Andrica's Conjecture	Harborth Graph	Rational Distance Problem
Artin's Conjecture	Hard Square Entropy Co...	Rational Number
Aspiring Number	Hardy-Littlewood Conje...	Rectilinear Crossing N...
Baillie-PSW Primality...	Harmonic Series	Riemann Hypothesis
Ball Triangle Picking	Hasse's Conjecture	Riemann Zeta Function
Barker Code	Heilbronn Triangle Pro...	Robin's Theorem
Barnette's Conjecture	Hilbert's Problems	Ruth-Aaron Pair
Baxter-Hickerson Function	Hodge Conjecture	Sausage Conjecture
Beal's Conjecture	Hoffman-Singleton Theorem	Schanuel's Conjecture
Bell Number	Holyhedron	Schinzel's Hypothesis
Benson's Formula	Hyperbolic Knot	Scholz Conjecture
Beraha Constants	Hyperbolic Octahedron	Selfridge's Conjecture
Berry Conjecture	Hypercube Line Picking	Sendov Conjecture
Borwein Conjectures	Hypercube Point Picking	Seymour Conjecture
Bouniakowsky Conjecture	Idoneal Number	Shanks' Conjecture
Braun's Conjecture	Isomorphic Factorization	Shannon Capacity
Brocard's Conjecture	Jacobian Conjecture	Shephard's Conjecture
Carmichael's Totient F...	Juggler Sequence	Sierpiński's Composite...
Catalan's Aliquot Sequ...	k-Tuple Conjecture	Sierpiński Number of t...
Central Binomial Coeff...	Kaplan-Yorke Conjecture	Simon's Problems
Central Trinomial Coef...	Khinchin's Constant	Simplex Simplex Picking
Class Number	Kimberling Sequence	Smale's Problems
Coin Problem	Kobon Triangle	Smarandache Function
Coin Tossing	Kreisel Conjecture	Social Golfer Problem
Collatz Problem	Landau's Problems	Solitary Number
Complementary Subspace...	Langlands Program	Sophie Germain Prime
Completely Positive Ma...	Langton's Ant	Sphere Packing
Concurrent Normals Con...	Latin Square	Sphere Tetrahedron Pic...
Constant Problem	Legendre's Conjecture	Spherical Code
Costas Array	Lehmer's Constant	Square Point Picking
Cramér Conjecture	Lehmer's Mahler Measur...	Strong Pseudoprime
Cramér-Granville Conje...	Lehmer's Totient Problem	Strongly Regular Graph
Cube 3-Compound	Levy's Conjecture	Swinnerton-Dyer Conjec...
Cube Triangle Picking	Lichtenbaum-Quillen Co...	Szpiro's Conjecture
Cycle Double Cover Con...	Local Density Conjecture	Tait's Knot Conjectures
Cyclic Number	Log Gamma Function	Tanc Function
de Polignac's Conjecture	Madelung Constants	Taylor's Condition
Deletable Prime	Magic Square	Ternary
Determined by Spectrum	Mandelbrot Set	Tetrahedral Number
Disk Triangle Picking	Markström Graph	Tetrahedron Circumscri...
Double Mersenne Number	Mastermind	Tetrahedron Line Picking
Earth-Moon Problem	Matchstick Graph	Tetrahedron Triangle P...
Eberhart's Conjecture	Mersenne Prime	Thurston Elliptization...
Edge-Graceful Graph	Mertens Theorem	Thurston's Geometrizat...
Eight Curve	Montgomery-Odlyzko Law	Totient Function
Erdős-Ivić Conjecture	Montgomery's Pair Corr...	Totient Valence Function
Erdős-Straus Conjecture	Mrs. Perkins's Quilt	Tower of Hanoi
Erdős-Turán Conjecture	Multiplicative Persist...	Traveling Salesman Pro...
Eternity	Net	Triangle Triangle Picking
Euclid-Mullin Sequence	New Mersenne Prime Con...	Trinomial Coefficient
Euler's Conjecture	Newman's Conjecture	Twin Prime Conjecture
Euler-Mascheroni Constant	Nonhamiltonian Vertex-...	Twin Primes
Euler Square	Normal Number	Ulam's Conjecture
Euler's Sum of Powers...	NP-Problem	Unfolding
Exponential Integral	Octahedral Number	Uniformity Conjecture
Factorial Sums	Octahedron Tetrahedron...	Union-Closed Sets Conj...
Fermat-Catalan Conjecture	Odd Perfect Number	Unistable Polyhedron
Flint Hills Series	Oloid	Universal Turing Machine
Fortunate Prime	Orchard-Planting Problem	Unsolved Problems
Four Exponentials Conj...	Ore's Conjecture	Untouchable Number
Friendly Number	P Versus NP Problem	Vizing Conjecture
Friendly Pair	Padé Conjecture	Vojta's Conjecture
Fuglede's Conjecture	Palindromic Number Con...	Wagstaff's Conjecture
Full Reptend Prime	Percolation Threshold	Wagstaff Prime
Gelfand's Question	Perfect Cuboid	Wall-Sun-Sun Prime
Generalized Moore Graph	Perfect Magic Cube	Waring's Prime Number...
Generalized Riemann Hy...	Perfect Number	Weil Conjectures
Gilbreath's Conjecture	Pi Formulas	Weird Number
Giuga's Conjecture	Pillai's Conjecture	Wilson Prime
Goldbach Conjecture	Pollock's Conjecture	Wolstenholme Prime
Goldbach Partition	Pósa's Conjecture	Znám's Problem
Golomb Ruler	Positive Eigenvalued M...
Graph Crossing Number	Powerful Number Wolfram