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 A152623 Decimal expansion of 3/2. 8
 1, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Sum of the inverses of the tetrahedral numbers (A000292). - Michael B. Porter, Nov 27 2017 For any triangle ABC, cos A + cos B + cos C <= 3/2; equality is obtained only when the triangle is equilateral (see the Kiran S. Kedlaya link). - Bernard Schott, Sep 17 2022 LINKS Table of n, a(n) for n=1..99. Kiran S. Kedlaya, A < B, (1999), Problem 6.2, p. 6. EXAMPLE 1.5000000000000000000000000000000000000000000000000000000000... PROG (PARI) 3/2. \\ Charles R Greathouse IV, Jan 10 2022 CROSSREFS Cf. A000292 (tetrahedral numbers). Sums of inverses: A002117 (cubes), A175577 (octahedral numbers), A295421 (dodecahedral numbers), A175578 (icosahedral numbers). Cf. A002194, A020821, A104956 (other trigonometric inequalities). Sequence in context: A336587 A336586 A241471 * A020761 A341881 A281462 Adjacent sequences: A152620 A152621 A152622 * A152624 A152625 A152626 KEYWORD nonn,cons,easy AUTHOR N. J. A. Sloane, Oct 30 2009 STATUS approved

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Last modified September 23 07:14 EDT 2023. Contains 365534 sequences. (Running on oeis4.)