A177004 Numbers n such that 2 nearest neighbors had largest prime factor equals to 1, next 2 neighbors had largest prime factor of 2 and next 2 neighbors had largest prime factor of 3.

1516128, 7026352, 7929128, 10296372, 10449948, 12045128

Offset

1,1

Comments

1516128-3=3*5^3*13*311; 1516128-2=2*47*127^2; 1516128-1=1516127; 1516128+1=1516129; 1516128+2=2*5*7*11^2*179; 1516128+3=3^3*233*241,..

Links

Table of n, a(n) for n=1..6.

Mathematica

f[n_]:=Max[Last/@FactorInteger[n]]; lst={}; Do[If[f[n-1]==1&&f[n-2]==2&&f[n-3]==3&&f[n+1]==1&&f[n+2]==2&&f[n+3]==3, Print[n]; AppendTo[lst, n]], {n, 4*9!, 4*10!}]; lst

Crossrefs

Sequence in context: A254173 A254166 A254455 * A346674 A236154 A126252

Adjacent sequences: A177001 A177002 A177003 * A177005 A177006 A177007

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Apr 30 2010

Status

approved