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 A261869 First differences of A055615. 4
 -3, -1, 3, -5, 11, -13, 7, 0, 10, -21, 11, -13, 27, 1, -15, -17, 17, -19, 19, 21, 1, -45, 23, 0, 26, -26, 0, -29, -1, -1, 31, 33, 1, 1, -35, -37, 75, 1, -39, -41, -1, -1, 43, 0, 46, -93, 47, 0, 0, 51, -51, -53, 53, 55, -55, 57, 1, -117, 59, -61, 123, -62, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) = (n+1)*mu(n+1) - n*mu(n), where mu = A008683 (Moebius function); a(A068781(n)) = 0; abs(a(n)) <= 2*n + 1. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 MATHEMATICA #[[2]]-#[[1]]&/@Partition[Table[n*MoebiusMu[n], {n, 70}], 2, 1] (* Harvey P. Dale, Apr 17 2016 *) PROG (Haskell) import Data.List (genericIndex) a261869 n = genericIndex a261869_list (n - 1) a261869_list = zipWith (-) (tail a055615_list) a055615_list CROSSREFS Cf. A008683, A055615, A068781, A261890 (first differences). Sequence in context: A339413 A114144 A050820 * A279697 A133179 A282221 Adjacent sequences: A261866 A261867 A261868 * A261870 A261871 A261872 KEYWORD sign AUTHOR Reinhard Zumkeller, Sep 04 2015 STATUS approved

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Last modified July 24 13:53 EDT 2024. Contains 374584 sequences. (Running on oeis4.)