the next two are 174 and 522.
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174 =============== 18 = 15+3 54 = 18x3 57 = 54+3 171= 57x3 174= 171+3
The pattern is add three and then multiply by three. The next number is 174.
18 multiplied by 3 = 54
171/57 = 3
Yes. 171 is evenly divisible by three. (3 x 57 = 171).