The answer expected is exactly the one provided by Henry's code which, for the
first 10 terms, just copy/pasting from the J console, is:
next=.5&(0 3 + *)
(i. 10) next 1 0
1 0
5 3
25 18
125 93
625 468
3125 2343
15625 11718
78125 58593
390625 292968
1953125 1464843
What I'm now speaking about is only how to improve this code, since it seems
wasting a huge amount of time too me, though I'm not sure about it, being a
beginner in J!
Alessandro
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