Math Help - Series Help

1. Series Help

how this series is generated

1,1,1 2,1 2 3,1 2 3 4 5, 1 2 3 4 5 6 7 8

2. Originally Posted by srivatsan
how this series is generated

1,1,1 2,1 2 3,1 2 3 4 5, 1 2 3 4 5 6 7 8
The last digit in the $n$-th block is the sum of the last digits in the two preceding blocks, with the initial condition that the first two terms are $1$ and $1$. This makes the $n$-th block the numbers $1$ to $F_n$ where $F_n$ is the $n$-th Fibonacci number.

CB