

A151750


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


5




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) 281344.
C. Pomerance, Divisors of the middle binomial coefficient, Amer. Math. Monthly, 112 (2015), 636644.


CROSSREFS

Sequence in context: A252215 A250760 A184452 * A252636 A324678 A068266
Adjacent sequences: A151747 A151748 A151749 * A151751 A151752 A151753


KEYWORD

nonn,bref


AUTHOR

N. J. A. Sloane, Jul 30 2009


STATUS

approved



