Mathematics

[kind garden]

are you trying to find general formula for a_n?

I would just start by listing few elements and spotting pattern, then you can prove it by induction if you want to.

a1=1
a2=1*7
a3=1*7*7
a4=1*7*7*7

try to rewrite it using powers and you might spot the pattern

[kind garden]

Im not sure

this is more like from algebra

this sequence is called geometric

[autumn stag]

in general yes, but this is a very simple example of a recurrence relation

[narrow spruce]

.close question deleted