Re: [math-fun] integers that are either square or thrice a square, where do such beasts hide?

The statement reminded me of Concrete Mathematics' problem 5.112: 5.112: Is \binom{2n}{n} divisible by either 4 or 9, for all n > 4 except n = 64 or n = 256? This is from 1994 or so. I *think* Lagarias et al solved this circa 1996, and IIRC the answer is yes. Andres. On 8/29/18 8:01 , Wouter Meeussen wrote:

do they occur anywhere naturally? in combinatorics or in number theory? I bumped into them by accident looking at bracelet-stuff.

Wouter. _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun .