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A125117
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First differences of A034887.
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2
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0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| This sequence is not periodic because log(2)/log(10) is an irrational number. - T. D. Noe (noe(AT)sspectra.com), Jan 10 2007
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FORMULA
| a(n) = number_of_digits{2^(n+1)}-Number_of_digits{2^(n)} with n>=0.
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EXAMPLE
| a(1)=0 because 2^(1+1)=4 (one digit) 2^1=2 (one digit) and the difference is 0
a(3)=1 because 2^(3+1)=16 (two digits) 2^(3)=8 (one digit) and the difference is 1
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MAPLE
| P:=proc(n) local i, j, k, w, old; k:=2; for i from 1 by 1 to n do j:=k^i; w:=0; while j>0 do w:=w+1; j:=trunc(j/10); od; if i>1 then print(w-old); old:=w; else old:=w; fi; od; end: P(1000);
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CROSSREFS
| Sequence in context: A020987 A072786 A144597 * A144603 A163581 A100283
Adjacent sequences: A125114 A125115 A125116 * A125118 A125119 A125120
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KEYWORD
| easy,nonn,base
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Jan 10 2007
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