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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
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1, 2, 4, 11, 25, 64, 171, 569, 3406, 27697, 243374, 1759619
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..12.
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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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Sequence in context: A131434 A100550 A071973 * A122121 A080009 A159336
Adjacent sequences: A086421 A086422 A086423 * A086425 A086426 A086427
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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
Two more terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Aug 24 2009
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STATUS
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approved
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