The next number is 48.
55
It is 21 + 34 = 55
This is called the Fibonacci sequence. The last two numbers in the sequence are added together to produce the next. Therefore, following 8 and 13 are: 8 + 13 = 21 13 + 21 = 34 21 + 34 = 55 34 + 55 = 89 55 + 89 = 144
The Fibonacci sequence is infinite. The next two terms are 89 and 144.
The next number is 48.
55
55
The numbers in the sequence are decreasing by 8 each time. Therefore, the next number in the sequence is 47 - 8 = 39.
34, 55, 89, 144 is a portion of the Fibonacci sequence. The next number is 89 + 144 which is 233.
6590. One possible sequence is 2472/3N3 - 14421/2N2 + 26165/6N - 1390
The next number in the Fibonacci (note the spelling) sequence is 144. Each number after the initial 1s is the sum of its two predecessors.
66
55 is the largest triangular number in the Fibonacci sequence. 55 is a popular speed limit 55 is a odd
34-55-89 are.
It is 21 + 34 = 55
I'm guessing your sequence is 1, 3, 6, 10, 15, ... In which case it continues: 21, 28, 36, 45, 55, 66, ... (These are the triangular numbers.)