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 A136910 Numbers k such that k and k^2 use only the digits 0, 2 and 5. 1
 0, 5, 50, 500, 505, 5000, 5005, 5050, 50000, 50005, 50050, 50500, 500000, 500005, 500050, 500500, 500505, 505000, 5000000, 5000005, 5000050, 5000500, 5000505, 5005000, 5005050, 5050000, 5050005, 50000000, 50000005, 50000050, 50000500, 50000505, 50005000, 50005005, 50005050, 50050000, 50050500, 50500000, 50500005, 50500050, 500000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Generated with DrScheme. LINKS Jonathan Wellons, Table of n, a(n) for n = 1..446 J. Wellons, Tables of Shared Digits [archived] EXAMPLE 505000500500005^2 = 255025505505255550255005000025. MATHEMATICA Select[FromDigits/@Tuples[{0, 2, 5}, 9], SubsetQ[{0, 2, 5}, IntegerDigits[ #^2]]&] (* Harvey P. Dale, May 30 2019 *) CROSSREFS Sequence in context: A299868 A136915 A136918 * A267663 A093143 A346937 Adjacent sequences: A136907 A136908 A136909 * A136911 A136912 A136913 KEYWORD base,nonn AUTHOR Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008 STATUS approved

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Last modified May 18 08:45 EDT 2024. Contains 372618 sequences. (Running on oeis4.)