The hint it's like the famous fibonacci series
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Add the r2 previous numbers together
239+388 = 627
239+388 = 627
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It is a fibanacci sequence ewhere the 2 pervious number equal the third number. here you are 627, 1015, 1642, 2657
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239 + 388 = 627
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Here's the pattern: 3+28=31+28=59+31=90+59, etc.