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 A257898 Decimal expansion of Sum_{n=2..infinity} (-1)^n/log(log(n)), negated. 7
 1, 1, 4, 7, 7, 9, 6, 8, 0, 1, 3, 9, 8, 7, 0, 7, 5, 9, 1, 1, 5, 0, 7, 7, 8, 8, 9, 6, 7, 5, 6, 7, 9, 6, 1, 9, 1, 6, 6, 5, 1, 8, 8, 6, 8, 4, 3, 2, 8, 7, 6, 5, 2, 3, 0, 3, 2, 3, 1, 4, 7, 6, 5, 5, 4, 6, 8, 5, 6, 2, 1, 0, 6, 1, 4, 7, 4, 7, 0, 4, 4, 8, 9, 6, 5, 5, 8, 2, 4, 0, 2, 2, 1, 2, 7, 6, 5, 8, 9, 3, 1, 6, 1, 7, 7, 5, 5, 8, 5 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 2,3 COMMENTS A very slowly convergent series, converging in virtue of Leibniz's rule. LINKS Eric Weisstein's World of Mathematics, Leibniz Criterion Wikipedia, Alternating series test EXAMPLE -11.47796801398707591150778896756796191665188684328765... MAPLE evalf(sum((-1)^n/log(log(n)), n = 2..infinity), 120); MATHEMATICA NSum[(-1)^n/Log[Log[n]], {n, 2, Infinity}, AccuracyGoal -> 120, Method -> "AlternatingSigns", WorkingPrecision -> 200] PROG (PARI) default(realprecision, 120); sumalt(n=2, (-1)^n/log(log(n))) CROSSREFS Cf. A099769, A257837, A257812. Sequence in context: A070326 A103711 A199435 * A333286 A159919 A310929 Adjacent sequences:  A257895 A257896 A257897 * A257899 A257900 A257901 KEYWORD nonn,cons AUTHOR Iaroslav V. Blagouchine, May 12 2015 STATUS approved

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Last modified June 24 21:50 EDT 2021. Contains 345433 sequences. (Running on oeis4.)