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 A063848 Numbers k such that mu(k) + mu(k+1) + mu(k+2) = 2. 1
 14, 20, 32, 34, 38, 55, 56, 84, 86, 91, 92, 94, 117, 118, 121, 122, 132, 133, 140, 142, 143, 144, 145, 158, 159, 176, 183, 200, 202, 203, 204, 205, 208, 212, 214, 215, 216, 218, 219, 235, 247, 252, 297, 298, 299, 300, 302, 303, 319, 325, 326, 327, 328, 333 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harry J. Smith, Table of n, a(n) for n = 1..1000 MATHEMATICA Flatten[Position[Partition[MoebiusMu[Range[350]], 3, 1], _?(Total[#]==2&), {1}, Heads->False]] (* Harvey P. Dale, Nov 26 2015 *) PROG (PARI) m(n) = moebius(n)+moebius(n+1)+moebius(n+2); j=[]; for(n=1, 1000, if(m(n)==2, j=concat(j, n))); j (PARI) M(n) = moebius(n) + moebius(n + 1) + moebius(n + 2) { n=0; for (m=1, 10^9, if(M(m)==2, write("b063848.txt", n++, " ", m); if (n==1000, break)) ) } \\ Harry J. Smith, Sep 01 2009 CROSSREFS Cf. A063838. Sequence in context: A186193 A285426 A108874 * A110968 A054017 A129216 Adjacent sequences: A063845 A063846 A063847 * A063849 A063850 A063851 KEYWORD easy,nonn AUTHOR Jason Earls, Aug 26 2001 STATUS approved

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Last modified May 17 19:53 EDT 2024. Contains 372607 sequences. (Running on oeis4.)