It was Fibonacci of Pisa except that his version did not start with a 0.
13 & 21
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
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
13:21
n + 13 = 21. n = 21 - 13
13 & 21
Made - 2002 Rapper Amos 13-21 was released on: USA: 2013
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
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
21 and 13. The pattern is t(n) = (-n4 + 10n3 - 23n2 + 38n - 12)/12
2+3=53+5=85+8=1313+21=3333 is the next number in this pattern. This pattern is called a Fibonacci.
If you mean: 1 2 3 5 8 13 then the next number is 8+13 = 21
a kid who thought that 9+10=21 and ran away because he went viral and people made fun of them
-21
13:21
a kid who thought that 9+10=21 and ran away because he went viral and people made fun of them
With only two numbers it is difficult to find a pattern but I would imagine that this is a simple one since those are the only two numbers provided. If you do 21-13=8 you see that the difference is 8 so therefore, you would add 8 to each continuing number of the sequence. The pattern would be 13, 21, 29, 37, 45, 53, 61, 69