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A262211
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Minimum number of 12's such that n*[n; 12, ..., 12, n] = [x; ..., x] for some x, where [...] denotes simple continued fractions.
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20
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1, 1, 1, 2, 1, 5, 3, 5, 5, 9, 1, 6, 5, 5, 7, 8, 5, 19, 5, 5, 9, 23, 3, 14, 13, 17, 5, 2, 5, 31, 15, 9, 17, 5, 5, 36, 19, 13, 11, 19, 5, 43, 9, 5, 23, 45, 7, 5, 29, 17, 13, 12, 17, 29, 11, 19, 5, 59, 5, 30, 31, 5, 31, 20, 9, 65, 17, 23, 5, 13, 11, 3, 73, 29, 19, 29, 13, 79, 23, 53, 19, 81, 5, 8, 43, 5, 19, 14, 5, 41, 23, 31, 45, 59, 15, 48, 5, 29
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OFFSET
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2,4
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COMMENTS
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Sequence A261311 lists fixed points of this sequence.
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LINKS
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MATHEMATICA
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f[m_, n_] := Block[{c, k = 1}, c[x_, y_] := ContinuedFraction[x FromContinuedFraction[Join[{x}, Table[m, {y}], {x}]]]; While[First@ c[n, k] != Last@ c[n, k], k++]; k]; f[12, #] & /@ Range[2, 120] (* Michael De Vlieger, Sep 16 2015 *)
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PROG
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(PARI) cf(v)={t=v[#v]; forstep(i=#v-1, 1, -1, t=v[i]+1/t); t}
A262211(n, d=12)=for(k=1, 9e9, (c=contfrac(cf(vector(k+2, i, if(i>1&&i<k+2, d, n)))*n))[1]==c[#c]&&return(k))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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