Project Euler #14: Longest Collatz sequence

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    Am I the only one facing problem with this code.... Starting number with the longest Collatz sequence up to 20 is 18 but why is the compiler expecting the answaer to be 19? 18>9>28>14>7>22>11>34>17>52>26>13>40>20>10>5>16>8>4>2>1