An arithmetic series is a pattern of a series of numbers with same difference. First, let's find the difference:
16 -5 = 11
27- 16 = 11
So, the arithmetic series is obtained by adding 11 to every previous number. The formula for an arithmetic series is
An = A1 + (n - 1)d
where An is the nth term in the series, A1 is the 1st term in the series, n is the number of terms in the series and d is the difference. Hence,
A23 = 5 + (23 -1)11
A23 = 5 + 11(22)
A23 = 247
Thus, the 23rd term is 247.