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A215755 Denominators of the continued fraction convergents of log_10(7). 1
1, 6, 13, 71, 439, 510, 2455069, 2455579, 4910648, 12276875, 29464398, 71205671, 100670069, 171875740, 272545809, 1807150594, 9308298779, 11115449373, 931890596738, 6534349626539, 14000589849816, 20534939476355, 34535529326171, 55070468802526, 475099279746379, 2430566867534421 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

7^a(n) gets increasingly close to 10^(numerator of convergent).

LINKS

Table of n, a(n) for n=1..26.

MATHEMATICA

Rest[Denominator[Convergents[Log[10, 7], 30]]] (* Harvey P. Dale, Aug 23 2013 *)

PROG

(PARI) default(realprecision, 21000); for(i=1, 100, print(contfracpnqn(contfrac(log(7)/log(10), 0, i))[2, 1]))

CROSSREFS

Cf. A046104, A073733.

Numerators are in A215759.

Sequence in context: A301605 A119110 A041305 * A144535 A042641 A292121

Adjacent sequences:  A215752 A215753 A215754 * A215756 A215757 A215758

KEYWORD

nonn,frac

AUTHOR

V. Raman, Aug 23 2012

STATUS

approved

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Last modified August 26 05:23 EDT 2019. Contains 326328 sequences. (Running on oeis4.)