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A136907 Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 9. 1
0, 2, 7, 20, 27, 47, 70, 97, 200, 270, 470, 497, 700, 970, 997, 2000, 2700, 4700, 4970, 4997, 7000, 9700, 9970, 9997, 20000, 22247, 27000, 44747, 44777, 47000, 49700, 49777, 49970, 49997, 70000, 97000, 99700, 99970, 99997, 200000, 222470, 270000, 447470, 447770, 470000, 497000, 497770, 499297, 499700, 499777, 499970, 499997, 700000, 704997, 970000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
EXAMPLE
949092947094747^2 = 900777422224992227907794994009.
CROSSREFS
Sequence in context: A035402 A182655 A356396 * A259144 A090145 A244307
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved

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Last modified February 26 02:39 EST 2024. Contains 370335 sequences. (Running on oeis4.)