The pattern is add three and then multiply by three. The next number is 174.
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174 =============== 18 = 15+3 54 = 18x3 57 = 54+3 171= 57x3 174= 171+3
171 - 38 = 133 so 133 + 38 sum to 171
100 + 71 = 171, as does 99 + 72, 98 + 73, and so on.
131 all have odd numbers, so does 151 and 171. i would say 161 is the one that doesn't belong because it has an even number in it.
15