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A053884
Numbers k such that k^2 contains only digits {1,2,7}.
1
1, 11, 1489, 4596489, 4144600242739, 130834904430015239
OFFSET
1,2
CROSSREFS
Cf. A053885.
Sequence in context: A160264 A351597 A076168 * A027880 A222841 A287035
KEYWORD
nonn,base,more
AUTHOR
Patrick De Geest, Mar 15 2000
EXTENSIONS
One more term from Jon E. Schoenfield, Sep 03 2006
One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 23 2007
STATUS
approved