Quote:
Originally Posted by SneakySnake
something to do with square roots? hmmmmmmmm brain hurting...
 I don't know how to do it backwards...
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You are on to something.
Quote:
Originally Posted by pdurrant
Are the numbers all years in the 20th century?
1901, 1903, 1922, 1966, 1970, 1981?
In which case, there's something that happened in each of those years, but I've no idea what!
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No, nothing like that.
I promised a big new clue so here it is. The first three terms of a linked series:
1,4,36,?