A033829 Numbers that can be expressed as the product of two 3-digit numbers in at least one way.

10000, 10100, 10200, 10201, 10300, 10302, 10400, 10403, 10404, 10500, 10504, 10506, 10600, 10605, 10608, 10609, 10700, 10706, 10710, 10712, 10800, 10807, 10812, 10815, 10816, 10900, 10908, 10914, 10918, 10920, 11000, 11009, 11016

Offset

1,1

Comments

Last term is 998001=999*999.

Links

Table of n, a(n) for n=1..33.

Mathematica

nMax=12000; lim=Min[999, Ceiling[nMax/100]]; Select[Union[Times@@@Tuples[Range[100, lim], {2}]], #<=nMax&]  (* Harvey P. Dale, Mar 14 2011 *)

Prog

(PARI) listall()=my(v=List()); for(a=100, 999, for(b=a, 999, listput(v, a*b))); Set(v) \\ Charles R Greathouse IV, Oct 22 2014

Crossrefs

Sequence in context: A033433 A096973 A153747 * A371004 A004268 A004269

Adjacent sequences: A033826 A033827 A033828 * A033830 A033831 A033832

Keyword

nonn,fini,base

Author

Jeff Burch

Status

approved