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A167039
Squares that remain squares when prefixed with a 5.
3
625, 62500, 6250000, 58140625, 625000000, 5814062500, 6703515625, 62500000000, 581406250000, 670351562500, 6250000000000, 58140625000000, 67035156250000, 539545791015625, 625000000000000, 5814062500000000, 6703515625000000, 53954579101562500
OFFSET
1,1
COMMENTS
Numbers s of A000290 such that 5*10^A055642(s)+s is also in A000290.
EXAMPLE
625 = 25^2 is a square and becomes the square 5625 = 75^2 if a 5 is attached in front of its decimal representation.
CROSSREFS
Sequence in context: A017224 A106321 A017332 * A265932 A017452 A223230
KEYWORD
nonn,base
AUTHOR
Claudio Meller, Oct 27 2009
EXTENSIONS
Keyword:base added by R. J. Mathar, Oct 28 2009
More terms from Chai Wah Wu, Sep 11 2014
STATUS
approved