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 A261883 Decimal expansion of 1 - 2^(-1/3). 2
 2, 0, 6, 2, 9, 9, 4, 7, 4, 0, 1, 5, 9, 0, 0, 2, 6, 2, 6, 2, 4, 1, 4, 7, 1, 8, 0, 3, 6, 3, 8, 4, 5, 8, 6, 9, 8, 0, 4, 2, 5, 3, 3, 3, 6, 0, 5, 0, 0, 7, 3, 4, 9, 5, 0, 9, 5, 8, 5, 7, 1, 1, 9, 0, 8, 7, 3 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Blomer shows that there are x/log^k x powerful numbers up to x, where k = 0.20629947... is this constant. LINKS Table of n, a(n) for n=0..66. Valentin Blomer, Binary quadratic forms with large discriminants and sums of two squareful numbers II, Journal of the London Mathematical Society 71:1 (2005), pp. 69-84. Index entries for sequences related to powerful numbers EXAMPLE 0.20629947401590026262414718036384586980425333605007349509585711908739174... MATHEMATICA First@RealDigits[N[1 - 2^(-1/3), 120] (* Michael De Vlieger, Sep 04 2015 *) RealDigits[1-1/Surd[2, 3], 10, 120][[1]] (* Harvey P. Dale, Dec 05 2023 *) PROG (PARI) 1 - 2^(-1/3) CROSSREFS Cf. A076871, A001694. Sequence in context: A217572 A021833 A196072 * A294779 A049257 A054877 Adjacent sequences: A261880 A261881 A261882 * A261884 A261885 A261886 KEYWORD nonn,cons,easy AUTHOR Charles R Greathouse IV, Sep 04 2015 STATUS approved

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Last modified July 18 07:53 EDT 2024. Contains 374377 sequences. (Running on oeis4.)