hard · GMAT Quant
Start with an integer n from 20 through 60. Repeatedly replace the current integer by half of it if it is even, and by (3 times the integer plus 1)/2 if it is odd. Stop when a term first falls outside the interval from 20 through 60.
What is the sum of all starting values n for which the process stops above 60 after exactly two or three transformations and the first term above 60 is prime?
- 62
- 70
- 97
- 132
- 209
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