Leigh MercerLeigh Mercer (1893–1977) was a noted British wordplay and recreational mathematics expert. He is best known for devising the palindrome "A man, a plan, a canal: Panama!".
The following mathematical limerick is attributed to him: : This is read as follows: : A dozen, a gross, and a score : Plus three times the square root of four : Divided by seven : Plus five times eleven : Is nine squared and not a bit more. Provided by Wikipedia