Three or more terms of a sequence are needed in order to find its nth term.
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The nest number in the sequence is 18. Note that the difference between each number and the next number in the sequence follows the simple sequence of 1,2,3,4. Obviously the next in the sequence of increases is 5, so 13+5=18.
485 and 1457. The next number in the sequence is 2 more than treble the previous number.
The number that occurs most in a number sequence.
It is an irrational number; therefore the sequence is endless. The 'full number sequence' can never be known.
What is the the next number in the sequence 1,2,4,7,11,.....