Keep on adding increasing powers of 3.
from 1 to 2, we add 3 ^ 0
from 2 to 5 we add 3 ^ 1
from 5 to 14 we add 3 ^ 2
from 14 to 41 we add 3 ^ 3
and from 41 to 122 we add 3 ^ 4
so add 3 ^ 5 to 122 to get the next number and 3 ^ 6 to the next no to get the second next no.