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Search: id:A086876
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| 1, 2, 2, 2, 2, 2, 4, 2, 2, 4, 4, 4, 2, 2, 4, 4, 4, 4, 4, 4, 4, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 2, 4, 4, 4, 4, 4, 4, 6, 4, 6, 6, 6, 6, 6, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 2, 4, 4, 4, 4, 4, 4, 6, 4, 6, 6, 6
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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All a(n) are even for n>1.
Records occur at positions { 1,2,7,37,122,... } which correspond to run start positions { 2,4,16,126,512,... } in A071542.
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PROGRAM
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(PARI) e1(n)=sum(k=0, floor(log2(n)), bittest(n, k))
f(n)=local(c):c=0:while(n, n=n-e1(n):c=c+1):c
p=1:r=1:for(n=1, 150, c=0:while(f(r) == p, r=r+1:c=c+1):p=f(r):print1(c", "))
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CROSSREFS
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Sequence in context: A076500 A060594 A104361 this_sequence A066691 A064133 A105674
Adjacent sequences: A086873 A086874 A086875 this_sequence A086877 A086878 A086879
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KEYWORD
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nonn,easy
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AUTHOR
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Ralf Stephan (ralf(AT)ark.in-berlin.de), Aug 21 2003
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