One million integers
W A S D move Q E; roll (a la Elite),
R F up/down, mouse drag, move viewport (in an unintuitive way)
T toggle tooltip number display; click to factorise

Filter by predicate (JavaScript) on the index i. For example i%2==0 selects even points. true selects all points again.
number-theory functions are available as (e.g. nt.gcd(i,9)==3)
The array variables primes and composites are built in, and list all primes/composites < 1000000.