Feit-Thompson Conjecture
Concerns Primes 
and 
for which 
and 
have a common factor. The only 
pair with bothvalues less than 400,000 is (17, 3313), with a common factor 112,643.
References
Wells, D. G. The Penguin Dictionary of Curious and Interesting Numbers. London: Penguin, p. 17, 1986.
- Board
- Boatman's Knot
- Bochner Identity
- Bochner's Theorem
- Bode's Rule
- Bogdanov Map
- Bogomolov-Miyaoka-Yau Inequality
- Bohemian Dome
- Bohr-Favard Inequalities
- Bolyai-Gerwein Theorem
- Bolzano Theorem
- Bolzano-Weierstraß Theorem
- Bolza Problem
- Bombieri Inner Product
- Bombieri Norm
- Bombieri's Inequality
- Bombieri's Theorem
- Bond Percolation
- Bonferroni Correction
- Bonferroni's Inequality
- Bonferroni Test
- Bonne Projection
- Book Stacking Problem
- Boolean Algebra
- Boolean Connective