174
===============
18 = 15+3
54 = 18x3
57 = 54+3
171= 57x3
174= 171+3
Chat with our AI personalities
The pattern is add three and then multiply by three. The next number is 174.
171 - 38 = 133 so 133 + 38 sum to 171
the next two are 174 and 522.
171 1/7
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.