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URL: https://oeis.org/A053923

⇱ A053923 - OEIS


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A053923
Squares composed of digits {2,4,6}.
3
4, 64, 4624, 26244, 446224, 26646244, 44462224, 662444644, 4444622224, 6266622244, 26646644644, 444446222224, 44444462222224, 64664242622464, 624666644462224, 4444444622222224, 444444446222222224, 44444444462222222224, 64266662664264424464, 4444444444622222222224
OFFSET
1,1
COMMENTS
Includes all numbers of the form (2*(10^k-1)/3 + 2)^2 for k >= 1. - Andrew Howroyd, Oct 18 2024
FORMULA
a(n) = A053922(n)^2. - Andrew Howroyd, Oct 18 2024
MATHEMATICA
Table[Select[FromDigits/@Tuples[{2, 4, 6}, n], IntegerQ[Sqrt[#]]&], {n, 10}]//Flatten (* The program generates the first 10 terms of the sequence.
To generate more, increase the "n" constant but the program may take a long time to run. *) (* Harvey P. Dale, Sep 25 2021 *)
CROSSREFS
Cf. A053922.
Sequence in context: A193755 A194501 A348315 * A359231 A326868 A211214
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Mar 15 2000
STATUS
approved