A176350 First of three consecutive numbers with at least one 3 in their prime signature.

6858, 22625, 28375, 40472, 48248, 49624, 58374, 59750, 94471, 102248, 103624, 107702, 112374, 122823, 129623, 133623, 136214, 136375, 153063, 164295, 187623, 190375, 197910, 199624, 210248, 211624, 220374, 221750, 238248, 246616, 260874, 264248, 275750, 280231, 298375, 300806, 312471, 329623, 336824, 346086, 349623, 352375, 356375

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, Dec 07 2010

Keywords

• nonn

Examples

			6858=2*3^3*127,6859=19^3,6860=2^2*5*7^3,..
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000578, A001235, A176297, A176313.

Programs

Mathematica

f[n_]:=MemberQ[Last/@FactorInteger[n], 3]; Select[Range[9!],f[#]&&f[#+1]&&f[#+2]&]
SequencePosition[Table[If[MemberQ[FactorInteger[n][[All,2]],3],1,0],{n,360000}],{1,1,1}][[All,1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 09 2019 *)

Extensions

Edited by Matthew Vandermast, Dec 09 2010