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Search: id:A075537
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| A075537 |
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a(1)=1, a(2)=2, then use "merge and minus": a(n)=merge(a(n-2),a(n-1))-a(n-2)-a(n-1)). |
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2
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| 1, 2, 9, 18, 891, 17982, 89099109, 1798199982018, 890991089999910900891, 1798199982017999999998201800017982, 8909910899999109008909999999999999109008910000089099109
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A rapidly growing sequence. An even more rapidly growing sequence with "merge and minus" rule is A075538.
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EXAMPLE
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a(3)=9 because a(1)=1, a(2)=2 and a(3)=merge(a(1), a(2))-a(1)-a(2)=12-1-2=9; a(4)=18 because a(2)=2, a(3)=9 and a(4)=merge(a(2), a(3))-a(2)-a(3)=29-2-9=18.
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MATHEMATICA
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se={1, 2}; a=1; b=2; Do[ab=ToExpression[ToString[a]<>ToString[b]]-a-b; se=Append[se, ab]; a=b; b=ab, {i, 10}]; se
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CROSSREFS
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Cf. A075538.
Sequence in context: A068978 A006226 A109298 this_sequence A075340 A031316 A135207
Adjacent sequences: A075534 A075535 A075536 this_sequence A075538 A075539 A075540
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 20 2002
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