While there are not enough numbers to fully establish the sequence, the difference could be increasing by 3 each time, therefore, the sequence will go: 2, 5, 11, 20, 32...
Or, the differences could be doubling each time, meaning that the sequence will go: 2, 5, 11, 23, 47...
The next number in this sequence is 13112221.
5, 11, 17
This list of numbers is the list of prime numbers. Following 11, the next two numbers in the list are 13 and 17.
The next number in the sequence would be 23. The sequence consists of prime numbers.
11, -10, 9
17
11 and 8
They are a sequence of odd numbers. The next three in the sequence would be 17,19 & 21
These are all prime numbers. The next one is 17
Two possible answers spring immediately to mind. First, this sequence appears to be a list of the first five prime numbers; in this case, the next number in the sequence would be 13. Second, the intervals between these numbers comprise the sequence "1 2 2 4", in which the nth number equals the product of the (n-1)th and (n-2)th numbers. Based on this, the next number in the given sequence would be 11 + (4*2) = 19.
The sequence 14567911 appears to consist of consecutive prime numbers: 2, 3, 5, 7, 11, 13, 17. However, the numbers listed are not all consecutive primes but rather a mix that starts at 1 and skips some primes. The next number in the sequence after 11 would logically be 13, as it is the next prime number.
-3, -6, -11