Question

I have six terms: 5,7,11,19,35,67, what is a1

Answer 1

What do you think?

Answer 2

\[a1~~~~~usually~~written~~as~~a_1~~~is~~the~~first~~term~~of~~the~~sequence.\]

Answer 3

a(some number goes here)
represents a numbered place in the series

Answer 4

\[A_2=A_1+(1\times 2)\]\[A_3=A_2+(2\times 2)\]\[A_4=A_3+(3\times 2)\]\[A_5=A_4+(4 \times 2)\]Do you see the pattern?