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Search: id:A070823
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| A070823 |
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a(1)=0, a(1)=1, a(n+2)=abs(concatenate(a(n+1)a(n))-concatenate(a(n)a(n+1)). |
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1
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| 0, 1, 9, 72, 243, 47871, 23523372, 2434786275501, 8244905115337247871, 58101188398354233807319449027630, 243478627550182449084906698122045988902204111779759
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OFFSET
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1,3
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COMMENT
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a(n)==0 mod 3 if n>2. Is a(n) always of the form 2^a*3^b*b(n) where b(n) is a square-free number? As example : a(12)=3^12*11*192263*58877057*6250682413*588631991107100965223
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EXAMPLE
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a(2)=72 a(3)=243 then a(4)=abs(24372-72243)=47871
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CROSSREFS
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Sequence in context: A044196 A064201 A069978 this_sequence A073988 A005778 A110396
Adjacent sequences: A070820 A070821 A070822 this_sequence A070824 A070825 A070826
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 15 2002
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