The Nth term of the sequence is 20n-6
This is because the numbers go up in 20s, meaning the first number is 20
The first number in the sequence is not 20 nor is the second 40 but both are 6 short of that meaning the second number and the final nth term is 6.
With the nth term found out we can now work out the next few numbers.
The sequence only goes up to 5 so far so the next term would be the 6th term.
With the number term we replace the n for the number and times it.
the next numbers are 114, 134 and 154.
