They will always follow some Fibonacci sequence. If P and Q are any two numbers, then they belong to the Fibonacci sequence with the first two numbers as P and (Q-P).
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The five triangular numbers that follow 21 are 28, 36, 45, 55, and 66.
1000, 1023122434, 1243234 are all even numbers that come after 256. In increasing order the even numbers that immediately follow after 256 are 258, 260, 262, 264, ... In decreasing order, the even numbers that immediately follow 256 are 254, 252, 250, 248, ...
A Composite Number can be divided evenly by numbers other than 1 or itself.The Composite Numbers Between 1 and 10 are as follow.4, 6, 8, 9, 10.
There are approximately 2600 such numbers and this site is not suitable for listing them all. However, you may wish to follow the related link for all the primes in the range and remove them from the range.
The pattern is +5, -7... the answer is 6