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A018885
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Squares using only two distinct digits.
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3
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1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 225, 400, 441, 484, 676, 900, 1444, 7744, 10000, 11881, 29929, 40000, 44944, 55225, 69696, 90000, 1000000, 4000000, 9000000, 9696996, 100000000, 400000000, 900000000, 6661661161, 10000000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Alexandru Gica and Laurentiu Panaitopol, On Oblath's Problem, J. Integer Seqs., Vol. 6(3), 2003, article 03.3.5.
Eric Weisstein's World of Mathematics, See also
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FORMULA
| For n>3, a(n) = A016069(n-3)^2.
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CROSSREFS
| Cf. A016069, A016070, A018884.
Sequence in context: A000290 A162395 A144913 * A025741 A179459 A030476
Adjacent sequences: A018882 A018883 A018884 * A018886 A018887 A018888
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KEYWORD
| nonn,base
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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