Ed Pegg Jr <edp at wolfram.com> wrote:
:Primes and Fibonacci numbers are Venn-2.
:That is, there are numbers which are (!=not)
:P&F, !P&F, P&!F, !P&!F
:
:All 2^2 possibilities are represented.
:
:Is there a set of Venn-5 sequences, such that numbers exist for
:all 2^5 combinations?
Off the top of my head, I think that { n^2, n^3, n^5, n^7, n^11 }
would qualify.
Hugo