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-2 bytes thanks to H.PWiz.
((!!)$do x<-[0..]>>= \x->x<$[0];x<$[0..x])!!)
Try it online!Try it online!
This returns the nth element of the whole numbers where each i is replicated i + 1 times.
(([0..]>>= \x->x<$[0..x])!!)
Try it online!
(!!)$do x<-[0..];x<$[0..x]
(([1[0..]>>= \x->x<$[1>x<$[0..x+1]x])!!).pred
(([1..]>>= \x->x<$[1..x+1])!!).pred
