To get the next term, add the sum of all previous terms
to the most recent term.
5-8-13-21-34-56-90.... The next number is the sum of the two previous numbers. This is the Fibonacci sequence, 1-1-2-3-5-8-13-21-34-56-90 etc
89.
Add the previous 2 numbers to get the next number.
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
One possible rule is: Un = (243n5 - 4210n4 + 27225n3 - 60830n2 + 106452n - 45960)/120 for n = 1, 2, 3, etc
One possible rule is: Un = (219n5 - 3755n4 + 24075n3 - 70645n2 + 92166n - 36960)/120 for n = 1, 2, 3, etc
5-8-13-21-34-56-90.... The next number is the sum of the two previous numbers. This is the Fibonacci sequence, 1-1-2-3-5-8-13-21-34-56-90 etc
44
89.
Add the previous 2 numbers to get the next number.
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
One possible rule is: Un = (243n5 - 4210n4 + 27225n3 - 60830n2 + 106452n - 45960)/120 for n = 1, 2, 3, etc
34 55 89 etc..
55 and 89
0, 1, 1 (0+1), 2 (1+1), 3 (2+1), 5 (2+3), 8 (3+5), 13(5+8), 21 (13+8), 34 (21+13),....and so on.
47
The factors of 34 are 1, 2, 17, 34 To get to 13 you could use 13 ones or 6 twos and 1 one or some other combination of ones and twos.