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Search: id:A037271
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| A037271 |
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Number of steps to reach a prime under "replace n by concatenation of its prime factors", when applied to n-th composite number, or -1 if no such number. |
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18
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| 2, 1, 13, 2, 4, 1, 5, 4, 4, 1, 15, 1, 1, 2, 3, 4, 4, 1, 2, 2, 1, 5, 3, 2, 2, 1, 9, 2, 9, 6, 1, 15
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