There is no conjecture about the sum of the first 30 positive even numbers. The answer can be derived and proven. A statement that has been proven is no longer a conjecture.
There have been many attempts to try and prove it but so far none of these succeeded
A conjecture is a statement that is believed to be true, but has yet to be proven. Conjectures can often be disproven by a counter example and are then referred to as false conjectures.
One possible conjecture is that the product of two odd integers is 8. A conjecture does not have to be true, nor does it have to be sensible. It must be testable, though. Many conjectures were initially thought to be sensible and true but later proven to be false. And when the false nature is fully understood, in retrospect they no longer appear sensible either!
The Poincaré Conjecture.
theorem
Never
It is a proposition that is believed to be true but has not [yet] been proven to be true. Clearly, if proven to be false it would no longer be a conjecture.
There is no conjecture about the sum of the first 30 positive even numbers. The answer can be derived and proven. A statement that has been proven is no longer a conjecture.
theorem
There are no proven dangers, only rumor and conjecture.
It is a proposition or a belief that has not yet been proven.
Theorem
There is need for a conjecture. It is an easily proven fact that an even number minus an even number is always an even number.
There have been many attempts to try and prove it but so far none of these succeeded
A conjecture is a belief or opinion based on incomplete information or guesswork. In mathematics, a conjecture is a statement that is believed to be true but has not been proven.
A statement that might be true (based on some research or reasoning), but is not proven. Like a hypothesis, but not stated in as formal, or testable, way. So a conjecture is like an educated guess. Example: I heard the sound of a plastic bag, so I conjecture there might be some food!