Graham, Ronald L.
Termination of the sixth Goodstein Sequence ★
Author(s): Graham
Question How many steps does it take the sixth Goodstein sequence to terminate?
Keywords: Goodstein Sequence
Monotone 4-term Arithmetic Progressions ★★
Author(s): Davis; Entringer; Graham; Simmons
Question Is it true that every permutation of positive integers must contain monotone 4-term arithmetic progressions?
Keywords: monotone arithmetic progression; permutation
Pebbling a cartesian product ★★★
Author(s): Graham
We let denote the pebbling number of a graph .
Conjecture .
Divisibility of central binomial coefficients ★★
Author(s): Graham
Problem (1) Prove that there exist infinitely many positive integers such that
Problem (2) Prove that there exists only a finite number of positive integers such that
Keywords:
The large sets conjecture ★★★
Author(s): Brown; Graham; Landman
Conjecture If is 2-large, then is large.
Keywords: 2-large sets; large sets
Graham's conjecture on tree reconstruction ★★
Author(s): Graham
Problem for every graph , we let denote the line graph of . Given that is a tree, can we determine it from the integer sequence ?
Keywords: reconstruction; tree