There are many different combinations. One example is two and 31.
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I am not sure if any two consecutive numbers can add up to an even number.
All of your double numbers such as 33 and 77 occur within the first hundred numbers. Viz 11, 22, 33, up to 99. That is 9 double numbers.
2 and 17
No, even numbers are evenly divisible by two, which means that only the multiples of two are even numbers. Odd numbers make up the other integers. There is no such thing as an odd or even decimal.
They are: 13*13 = 169 or 167+2 = 169