Wha??? Sure it does 31 => 2 and 61 => 3 just like the OP: 

$ perl -e 'print int( (31-1) / 30 ) + 1, "\n"'
2
$ perl -e 'print int( (61-1) / 30 ) + 1, "\n"'
3

[download]

-derby

In reply to Re^4: condensing code by derby
in thread condensing code by Anonymous Monk

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