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!)
A134742 Numbers whose square is a permutational number A134640. 2
0, 1, 15, 50, 85, 195, 327, 561, 789, 867, 1323, 1764, 2450, 2751, 3213 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A134741(n)^(1/2)=a(n)

LINKS

Table of n, a(n) for n=1..15.

MATHEMATICA

a = {}; b = {}; Do[AppendTo[b, n]; w =Permutations[b]; Do[j = FromDigits[w[[m]], n + 1]; If[IntegerQ[j^(1/2)], AppendTo[a, j]], {m, 1, Length[w]}], {n, 0, 7}]; Sqrt[a] (*Artur Jasinski*)

CROSSREFS

Cf. A134640, A134641, A134642, A134643, A134644, A023811, A134741.

Sequence in context: A199899 A020257 A103777 * A191746 A029941 A194851

Adjacent sequences:  A134739 A134740 A134741 * A134743 A134744 A134745

KEYWORD

nonn

AUTHOR

Artur Jasinski, Nov 07 2007

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 21 14:12 EST 2014. Contains 249779 sequences.