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Search: id:A105068
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| A105068 |
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Number of distinct prime divisors of 10^n - 3. |
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+0
3
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| 1, 1, 1, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 4, 4, 1, 4, 5, 4, 2, 2, 4, 2, 2, 3, 4, 3, 4, 3, 6, 4, 3, 2, 4, 4, 5, 3, 5, 5, 4, 5, 7, 4, 5, 4, 7, 5, 4, 4
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OFFSET
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1,4
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EXAMPLE
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If n=1, 2 or 3, then 10^n - 3 = prime and thus the first three terms are 1.
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MATHEMATICA
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Table[Length[FactorInteger[10^n - 3]], {n, 1, 50}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 21 2006
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CROSSREFS
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Adjacent sequences: A105065 A105066 A105067 this_sequence A105069 A105070 A105071
Sequence in context: A054990 A046921 A078178 this_sequence A120676 A125973 A001031
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 05 2005
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 21 2006
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