October 1, 2010 Oban is a small town on the west coast of
Scotland, home to a rocky port, a small distillery, and a half-
built folly started by a banker with not-enough money and less
sense. I fondly remember a visit to Oban in 1987. My mother
bought a scarf, a tin of shortbread, and a wee dram of the local
whiskey at a small shop on the main street (it may have been one
of the shops in the picture, I’m not sure) and was scolded by
the waitress for using the wrong fork at dinner. Oban numbers
have nothing to do with Scotland, except that the name was the
occasion of pleasant reminiscing. MathWorld describes an oban
number as a number from which the letter “o” is missing when it
is spelled out in words (the letter “o” is “banned”). Your task
is to make a complete list of all the oban numbers. If your
language provides a function that spells out a number in words,
don’t use it, but write your own instead. When you are finished,
you are welcome to read or run a suggested solution, or to post
your own solution or