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A058461
Numbers k such that k^2 contains only digits {2,6,7}.
1
26, 526, 1636345826, 512130136076, 150573163864701424
OFFSET
1,1
CROSSREFS
Cf. A058462.
Sequence in context: A163201 A205990 A230247 * A323492 A265461 A257518
KEYWORD
nonn,base,hard,more
AUTHOR
Patrick De Geest, Nov 15 2000
EXTENSIONS
a(5) (from the Mishima web site) added by Max Alekseyev, Jan 11 2007
STATUS
approved