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A128876
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Denominator of the continued fraction convergents of the decimal concatenation of the powers of 10.
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0
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1, 9, 109, 990, 1099, 99900, 100999, 1008891, 1109890, 9888011, 50549945, 212087791, 1110988900, 9099998991, 10210987891, 100998890010, 1020199887991, 1121198778001, 12232187668001, 50049949450005, 212431985468021
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| The powers of 10 = 1,10,100,1000,10000,... are concatenated and then preceded by a decimal point to create the fraction N = .110100100010000... This number is then evaluated with n=0,m=steps to iterate,x = N, a(0)=floor(N) using the loop: do a(n)=floor(x) x=1/(x-a(n)) n=n+1 loop until n=m
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PROG
| (PARI) g(n) = f="."; for(x=0, n, a=concat(f, 10^x)); f=eval(f) { default(realprecision, 1000); cf = vector(1000); cf = contfrac(f); for(m1=0, m-1, r=cf[m1+1]; forstep(n=m1, 1, -1, r = 1/r; r+=cf[n]; ); numer=numerator(r); denom=denominator(r); print1(denom", "); numer2=numer; denom2=denom; ) }
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CROSSREFS
| Sequence in context: A157906 A166846 A058421 * A199030 A105974 A053912
Adjacent sequences: A128873 A128874 A128875 * A128877 A128878 A128879
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KEYWORD
| frac,nonn,base
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AUTHOR
| Cino Hilliard (hillcino368(AT)hotmail.com), Apr 18 2007
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EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 25 2010
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