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A058471
Numbers k such that k^2 contains only digits {7,8,9}.
1
3, 9949370777987917
OFFSET
1,1
CROSSREFS
Cf. A058472.
Sequence in context: A266199 A216148 A058453 * A068740 A058473 A115527
KEYWORD
nonn,base,hard,more,bref
AUTHOR
Patrick De Geest, Nov 15 2000
STATUS
approved