look, it is a problem in the datasheet, or i found a "super 4017". i made a 10 led circle wich turns. i put a current limiting resistor, and mesured the current at aroun 12-14ma. the problem is that the circuit worked well at a low voltage around 4.7V, and it worked non stop for a few weeks till i got bored by it and turned it off. the thing is tha even if it is limited to that kind of current if you power it at low voltage you can make a "super 4017"
and another thing, if you dont want to use a transistor for each led, you can use a buffer ic, it will be even cheaper maybe.