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A136889
Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 7.
1
0, 5, 50, 55, 235, 500, 505, 550, 755, 2350, 5000, 5005, 5050, 5055, 5500, 5505, 7550, 23500, 50000, 50005, 50050, 50055, 50235, 50500, 50505, 50550, 55000, 55005, 55050, 57055, 57735, 72335, 73055, 75500, 223735, 235000, 235005, 235235, 500000, 500005, 500050, 500055, 500235, 500500, 500505, 500550, 500755, 502350, 505000, 505005, 505050, 505500
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
J. Wellons, Tables of Shared Digits [archived]
EXAMPLE
75720230505^2 = 5733553307730332555025.
MATHEMATICA
Module[{c={0, 2, 3, 5, 7}, t1}, t1=FromDigits/@Tuples[c, 6]; Select[t1, SubsetQ[ c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Mar 29 2022 *)
CROSSREFS
Sequence in context: A059008 A218290 A136890 * A136887 A169964 A061474
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved