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Search: id:A134742
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A134742 Numbers whose square is a permutational number A134640. +0
3
0, 1, 15, 50, 85, 195, 327, 561, 789, 867, 1323, 1764, 2450, 2751, 3213 (list; graph; listen)
OFFSET

1,3

COMMENT

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

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, A134703, A134741.

Adjacent sequences: A134739 A134740 A134741 this_sequence A134743 A134744 A134745

Sequence in context: A065906 A020257 A103777 this_sequence A029941 A075928 A020214

KEYWORD

nonn

AUTHOR

Artur Jasinski (grafix(AT)csl.pl), Nov 07 2007

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Last modified January 8 02:43 EST 2009. Contains 152824 sequences.


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