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A016069 Numbers n such that n^2 contains exactly 2 different digits. +0
13
4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 20, 21, 22, 26, 30, 38, 88, 100, 109, 173, 200, 212, 235, 264, 300, 1000, 2000, 3000, 3114, 10000, 20000, 30000, 81619, 100000, 200000, 300000, 1000000, 2000000, 3000000, 10000000, 20000000 (list; graph; listen)
OFFSET

1,1

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, F24.

LINKS

Eric Weisstein's World of Mathematics, See also

CROSSREFS

Cf. A016070, A018884, A018885.

Sequence in context: A111222 A037357 A039174 this_sequence A039128 A162706 A088331

Adjacent sequences: A016066 A016067 A016068 this_sequence A016070 A016071 A016072

KEYWORD

nonn,easy,base,nice

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com)

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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