What two numbers add up to 1305?

There are infinite combinations of two numbers that add up to 1305. Here are some examples using negative numbers:

-1 + 1306 = 1305
-2 + 1307 = 1305
-3 + 1308 = 1305
...

Here are some examples using two fractions that will add up to 1305:

1305/2 + 1305/2 = 1305
2610/3 + 1305/3 = 1305
3915/4 + 1305/4 = 1305
...

And here are some examples using two decimal numbers that will add up to 1305:

1.25 + 1303.75 = 1305
2.50 + 1302.5 = 1305
3.75 + 1301.25 = 1305
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1305?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 1305. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 1305?" has 652 answers:

1 + 1304 = 1305
2 + 1303 = 1305
3 + 1302 = 1305
.
.
650 + 655 = 1305
651 + 654 = 1305
652 + 653 = 1305

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 1305 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1306?
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