Question 1046565
The occurances of the digit 3 are:
3, 13, 23, 30-32, 33, 34-39, 43, 53, 63, 73, 83, 93, 
103, 113, 123, 130-132, 133, 134-139, 143, 153, 163, 173, 183, 193,
203. . . . . 
303. . . . . 
403. . . . . 493
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This is the 1st line repeated 5 times
I count 20 3's in the 1st line
{{{ 5*20 = 100 }}}
Then I have to add 300  through 399 extra 3's on the 4th line
That's {{{ 100 }}} more 3's
{{{ 100 + 100 = 200 }}}
{{{ n = 200 }}} is my guess
You should get a 2nd opinion on this, however