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Search: id:A086424
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| A086424 |
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Numbers needed to generate all other natural numbers, only allowing multiplication and addition. Each number can be used only once. |
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+0
1
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OFFSET
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1,2
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EXAMPLE
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10 is not in the sequence because (4+1)*2 = 10.
11 is in the sequence because there is no way to get 11 by using the earlier terms.
509 is not in the sequence because 509 = (1+25)*(2+11)+171.
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CROSSREFS
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Adjacent sequences: A086421 A086422 A086423 this_sequence A086425 A086426 A086427
Sequence in context: A131434 A100550 A071973 this_sequence A122121 A080009 A123432
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KEYWORD
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more,nonn,nice
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AUTHOR
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Arno Bouwes (acbouwes(AT)hotmail.com), Sep 08 2003
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EXTENSIONS
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Corrected and extended by Don Reble, Sep 21, 2003
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