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    $\begingroup$ Range /@ Range[10] :-D $\endgroup$ Commented Apr 15, 2016 at 10:41
  • $\begingroup$ @JasonB: What? Hahaha... That really works. I am new in Mathematica. And haven't learnt that symbol '\@'. Could you explain? $\endgroup$ Commented Apr 15, 2016 at 10:44
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    $\begingroup$ So Range[x] will give {1, 2, 3, 4, 5,......x}, and /@ is the infix notation for Map. As an example, look f /@ {1, 2, 3} gives {f[1], f[2], f[3]}. So in the above, Range[10] gives {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, and then I'm just mapping Range onto that list $\endgroup$ Commented Apr 15, 2016 at 10:47
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    $\begingroup$ at least closely related: generate successive sublists from a list? $\endgroup$ Commented Apr 15, 2016 at 11:46
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    $\begingroup$ Or Range@Range[10]. See here under 'neat examples' $\endgroup$ Commented Apr 15, 2016 at 17:26