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 A248726 Decimal expansion of Sum_{k>=1} 1/(9^k - 1). 6
 1, 3, 9, 0, 4, 5, 1, 1, 7, 6, 6, 2, 1, 8, 8, 1, 2, 9, 3, 5, 8, 7, 2, 8, 4, 7, 4, 3, 6, 9, 0, 8, 9, 0, 5, 2, 1, 3, 9, 3, 6, 2, 6, 4, 7, 0, 6, 7, 8, 1, 9, 6, 0, 9, 5, 5, 1, 0, 3, 5, 4, 9, 3, 4, 7, 9, 6, 7, 0, 2, 0, 1, 4, 5, 3, 6, 6, 6, 6, 0, 7, 9, 8, 8, 6, 3, 3, 7, 9, 8, 1, 3, 5, 7, 6, 5, 5, 0, 5, 7, 9, 9, 5, 5, 3 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..10000 EXAMPLE 0.13904511766218812935872847436908905213936264706781960955103549347967020145366... MAPLE evalf(sum(1/(9^k-1), k=1..infinity), 120) # Vaclav Kotesovec, Oct 18 2014 MATHEMATICA x = 1/9; RealDigits[ Sum[ DivisorSigma[0, k] x^k, {k, 1000}], 10, 105][[1]] (* after an observation and the formula of Amarnath Murthy, see A073668 *) PROG (PARI) suminf(k=1, 1/(9^k-1)) \\ Michel Marcus, Oct 18 2014 CROSSREFS Cf. A065442, A073668, A214369, A248721, A248722, A248723, A248724, A248725. Sequence in context: A272535 A016626 A126321 * A267411 A021260 A215633 Adjacent sequences:  A248723 A248724 A248725 * A248727 A248728 A248729 KEYWORD nonn,cons AUTHOR Robert G. Wilson v, Oct 12 2014 STATUS approved

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Last modified January 23 01:45 EST 2019. Contains 319365 sequences. (Running on oeis4.)