They are: 41*42 = 1722
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No two consecutive numbers have a product that is an even number. Any two consecutive numbers include one odd number and one even number. The product of one odd number and one even number is always an odd number.
1332
A rectangular number is a number which is the product of two consecutive integers.
There are no two consecutive integers whose product is 421 - the product of 20 and 21 is 420.
There are no two consecutive integers, negative or positive, whose product is 440.