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 A179803 Numbers that contain the digital reverse of their square root. 2
 1, 25, 36, 729, 5476, 927369, 32752729, 37724164, 42562576, 97357689, 2825135104, 4325166756, 4860041796, 123715399824, 167904077121, 247679410276, 389724269841, 442094669604, 486004179600, 610118772201, 7473372660009, 15049783154025, 23983713798489, 25315841305225 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Giovanni Resta, Table of n, a(n) for n = 1..97 (terms < 1.6*10^25) FORMULA a(n) = A115761(n)^2. EXAMPLE The square root of 729 is 27. 27's digital reverse is 72. 72 appears in 729. MATHEMATICA fQ[n_] := StringPosition[ IntegerString[n^2], StringReverse@ IntegerString@ n] != {}; k = 1; lst = {}; While[k < 3879404, If[ fQ@k, AppendTo[lst, k^2]]; k++ ]; lst (* Robert G. Wilson v, Jul 28 2010 *) drsrQ[n_]:=Module[{s=Sqrt[n]}, MemberQ[Partition[Reverse[ IntegerDigits[ n]], IntegerLength[ s], 1], IntegerDigits[s]]]; Select[Range[ 28*10^5]^2, drsrQ] (* Harvey P. Dale, Dec 15 2015 *) CROSSREFS Cf. A115761. Sequence in context: A030681 A167363 A035383 * A061863 A079270 A253025 Adjacent sequences: A179800 A179801 A179802 * A179804 A179805 A179806 KEYWORD nonn,base AUTHOR Dominick Cancilla, Jul 27 2010 EXTENSIONS More terms from Robert G. Wilson v, Jul 28 2010 Terms a(22) and beyond from Giovanni Resta, May 04 2020 STATUS approved

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Last modified July 12 15:21 EDT 2024. Contains 374251 sequences. (Running on oeis4.)