1000 400 20 8
How about: 120+1.2 = 121.2
31 & 67
9 and 36
When you add two or more prime numbers you will only end up with a whole number and not a decimal number.
Add all of the numbers up, and then divide that result by how many numbers there were, e.g. 1,2,3,4,5. Added up they make 15. As there are five numbers there, you divide 15 by 5, and you get 3. Voila.
yes 1428/3 = 476 if you add numbers up and you can divide sum by 3 then it is divisible by 3 1+4+2+8 = 15 which is divisible by 3
5
37 & 41
How about: 120+1.2 = 121.2
Pairs of prime numbers which add up to 82 are:3 + 7911 + 7123 + 5929 + 5341 + 41
I am not sure if any two consecutive numbers can add up to an even number.
16
4 and 9.
31 & 67
9 and 36
13 & 17
When you add two or more prime numbers you will only end up with a whole number and not a decimal number.