A063849 Numbers k such that mu(k) + mu(k+1) + mu(k+2) = 1.

8, 13, 21, 24, 25, 26, 37, 44, 49, 50, 54, 57, 62, 63, 74, 75, 80, 90, 115, 116, 119, 120, 123, 134, 146, 157, 160, 175, 177, 185, 187, 206, 207, 209, 224, 234, 248, 253, 259, 260, 265, 274, 278, 287, 294, 295, 296, 304, 314, 321, 323, 324, 329, 332, 338, 340

Offset: 1

Author

Jason Earls, Aug 26 2001

Keywords

• easy
• nonn

Links

• Harry J. Smith, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A063838.

Programs

PARI

m(n)=moebius(n)+moebius(n+1)+moebius(n+2);
j=[]; for(n=1,1000, if(m(n)==1,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)==1, write("b063849.txt", n++, " ", m); if (n==1000, break)) ) } \\ Harry J. Smith, Sep 01 2009