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 A136819 Numbers k such that k and the square of k use only the digits 0, 1, 2, 4 and 7. 1
 0, 1, 2, 10, 11, 12, 20, 21, 100, 101, 102, 110, 120, 200, 201, 210, 421, 1000, 1001, 1002, 1010, 1011, 1012, 1020, 1021, 1071, 1100, 1101, 1102, 1200, 1201, 2000, 2001, 2010, 2011, 2100, 2101, 4210, 10000, 10001, 10002, 10010, 10011, 10012, 10020, 10021, 10100, 10110, 10120, 10200, 10210, 10710, 11000, 11001, 11002, 11010, 11011, 11020, 12000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Generated with DrScheme. LINKS Jonathan Wellons, Table of n, a(n) for n = 1..1154 J. Wellons, Tables of Shared Digits EXAMPLE 4702140701^2 = 22110127172000771401. MATHEMATICA With[{c={0, 1, 2, 4, 7}}, Select[Union[Flatten[FromDigits/@Tuples[c, 5]]], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Mar 24 2018 *) CROSSREFS Sequence in context: A136810 A136821 A105116 * A136816 A188264 A169683 Adjacent sequences:  A136816 A136817 A136818 * A136820 A136821 A136822 KEYWORD base,nonn AUTHOR Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008 STATUS approved

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Last modified June 24 09:37 EDT 2019. Contains 324323 sequences. (Running on oeis4.)