A151750 Numbers n such that gcd( binomial(2n,n), 3*5*7*11 ) = 1.

0, 1, 3160

Offset

1,3

Comments

It is conjectured that there are no other terms.

There are no further terms below 10^10000.

Links

Table of n, a(n) for n=1..3.

R. D. Mauldin, S. M. Ulam, Mathematical problems and games, Adv. Appl. Math. 8 (3) (1987) 281-344.

C. Pomerance, Divisors of the middle binomial coefficient, Amer. Math. Monthly, 112 (2015), 636-644.

Crossrefs

Sequence in context: A252215 A250760 A184452 * A031610 A252636 A324678

Adjacent sequences: A151747 A151748 A151749 * A151751 A151752 A151753

Keyword

nonn,bref

Author

N. J. A. Sloane, Jul 30 2009

Status

approved