0,1,1,2,3,5,8,13,21,34,55,89,144,199,343,542............... Just and from the previous number 0+1 1+1 1+2 2+3 3+5
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the first seven Fibonacci numbers are 1,1,2,3,5,8,13. 13 is a Fibonacci number.
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).
The negative Fibonacci numbers (also known as the Negafibonacci numbers) consist of the Fibonacci numbers in an alternating negative and positive pattern.The start of the Negafibonacci sequence runs thus:1, -1, 2, -3, 5, -8, 13, -21...And continues in a pattern identical to the Fibonacci numbers but with alternating negative and positive numbers.
Since zero is both a positive number (defined as such), and not part of the Fibonacci sequence, then the first positive non-Fibonacci number is zero (0). If zero does not fit in you definition of positive number, then the answer would be four (4).
0 + 1 + 1 + 2 + 3 + 5 + 8 = 20