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A137107 Numbers k such that k and k^2 use only the digits 2, 4, 7, 8 and 9. 1
2, 7, 22, 27, 28, 88, 222, 278, 288, 472, 478, 882, 972, 2788, 2878, 4722, 4778, 4788, 8788, 8882, 28772, 28788, 49272, 49277, 49472, 49722, 49777, 49778, 49788, 49827, 88277, 88472, 88878, 99722, 278788, 278978, 279272, 287972, 299788, 477278, 478277, 492222, 492878, 497788, 499472, 499478, 887288, 887972, 888228, 942222, 942278, 999472 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Generated with DrScheme.
LINKS
EXAMPLE
492792849479827^2 = 242844792498447429944479949929.
CROSSREFS
Sequence in context: A088591 A229493 A175871 * A284921 A174236 A131856
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved

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Last modified March 18 22:09 EDT 2024. Contains 370951 sequences. (Running on oeis4.)