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Search: id:A016070
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| A016070 |
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Numbers n such that n^2 contains exactly 2 different digits, excluding 10^m, 2*10^m, 3*10^m. |
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+0
5
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| 4, 5, 6, 7, 8, 9, 11, 12, 15, 21, 22, 26, 38, 88, 109, 173, 212, 235, 264, 3114, 81619
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 109, p. 38, Ellipses, Paris 2008.
R. K. Guy, Unsolved Problems in Number Theory, F24.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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CROSSREFS
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Cf. A016069, A018884, A018885.
Adjacent sequences: A016067 A016068 A016069 this_sequence A016071 A016072 A016073
Sequence in context: A030791 A039091 A120181 this_sequence A047569 A039062 A067187
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KEYWORD
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nonn,nice,base
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com)
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EXTENSIONS
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Next term if it exists is bigger than 9*10^7 - Michel ten Voorde (seqfan(AT)tenvoorde.org) Apr 12 2001
Next term if it exists is bigger than 8.8*10^9 - Paul.Jobling(AT)WhiteCross.com, Jun 10 2002
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