In the sequence 2, 10, 18, ... the common difference between successive terms is 8. To find the 31st term, we can use the formula for the nth term of an arithmetic sequence:
a_n = a_1 + (n - 1)d
where a_1 is the first term, d is the common difference, and n is the term number. Substituting the given values, we have:
a_31 = 2 + (31 - 1)8
a_31 = 2 + 240
a_31 = 242
Therefore, the 31st term in the sequence is 242.