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A136959 Numbers k such that k and k^2 use only the digits 0, 4, 7, 8 and 9. 1
0, 7, 70, 88, 97, 700, 707, 878, 880, 948, 970, 997, 7000, 7007, 7070, 8780, 8798, 8800, 8947, 9480, 9700, 9898, 9970, 9997, 70000, 70007, 70070, 70700, 70707, 87798, 87800, 87980, 88000, 89448, 89470, 94800, 97000, 98980, 99448, 99700, 99970, 99997, 700000, 700007, 700070, 700700, 707000, 707070, 877898, 877980, 877998, 878000, 879800 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
EXAMPLE
8989409879898^2 = 80809489988807774784490404.
MATHEMATICA
With[{c={0, 4, 7, 8, 9}}, Select[FromDigits/@Tuples[c, 6], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Jun 02 2019 *)
CROSSREFS
Sequence in context: A062901 A204094 A061476 * A136952 A136960 A003363
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved

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Last modified March 1 08:46 EST 2024. Contains 370430 sequences. (Running on oeis4.)