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A125122
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First differences of A034888.
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1
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0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 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(3)/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{3^(n+1)}-Number_of digits{3^(n)} with n>=0.
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EXAMPLE
| a(1)=0 because 3^(1+1)=9 (one digit) 3^1=3 (one digit) and the difference is 0
a(4)=1 because 3^(4+1)=243 (three digits) 3^(4)=81 (two digits) and the difference is 1
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MAPLE
| P:=proc(n) local i, j, k, w, old; k:=3; 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: A061265 A139312 A173923 * A000035 A188510 A131734
Adjacent sequences: A125119 A125120 A125121 * A125123 A125124 A125125
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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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