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A134741 Permutational numbers A134640 which are squares. 2
0, 1, 225, 2500, 7225, 38025, 106929, 314721, 622521, 751689, 1750329, 3111696, 6002500, 7568001, 10323369 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(n)^(1/2)=A134742(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}]; a (*Artur Jasinski*)

CROSSREFS

Cf. A134640, A134641, A134642, A134643, A134644, A023811, A134742.

Sequence in context: A105925 A014771 A184878 * A110204 A180697 A230065

Adjacent sequences:  A134738 A134739 A134740 * A134742 A134743 A134744

KEYWORD

nonn

AUTHOR

Artur Jasinski, Nov 07 2007

STATUS

approved

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Last modified January 18 11:14 EST 2019. Contains 319271 sequences. (Running on oeis4.)