login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A077292 Numbers n with property that n divides one of the concatenations (n-1)(n-2) or (n-2)(n-1). 0
2, 3, 4, 6, 7, 17, 34, 51, 67, 167, 334, 501, 667, 1667, 3334, 5001, 6667, 14286, 16667, 33334, 50001, 66667, 166667, 333334, 500001, 666667, 1666667, 2857143, 3333334, 5000001, 6666667, 16666667, 33333334, 50000001, 66666667 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No more terms through 10^8. - Ryan Propper, Oct 11 2005

LINKS

Table of n, a(n) for n=1..35.

EXAMPLE

6 and 7 are members: 6 divides 54, 7 divides 56.

MATHEMATICA

c[r_, s_] := ToExpression[ToString[r] <> ToString[s]]; Do[k = c[n-1, n-2]; m = c[n-2, n-1]; If[Mod[k, n] == 0 || Mod[m, n] == 0, Print[n]], {n, 2, 10^8}] (Propper)

ccQ[n_]:=Module[{id1=IntegerDigits[n-1], id2=IntegerDigits[n-2]}, Divisible[ FromDigits[ Join[id1, id2]], n]||Divisible[FromDigits[Join[id2, id1]], n]]; Select[Range[2, 67000000], ccQ] (* Harvey P. Dale, Jun 18 2012 *)

CROSSREFS

Sequence in context: A162570 A073639 A130776 * A171249 A036413 A069912

Adjacent sequences:  A077289 A077290 A077291 * A077293 A077294 A077295

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 03 2002

EXTENSIONS

More terms from Ray G. Opao, Sep 28 2005

2 more terms from Ryan Propper, Oct 11 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 26 14:56 EST 2014. Contains 250079 sequences.