Ono's team were able to measure the extent of this fractal behaviour in any sequence; Ramanujan's numbers are the only ones with none at all. That may be what he meant by simple properties, says Ono...
Trevor Wooley, a mathematician at the University of Bristol, UK, cautions that the use of the term "fractal" to describe what Ono's team found is more mathematical metaphor than precise description. "It's a word which conveys some of the sense of what's going on," he says.
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