A053884 Numbers k such that k^2 contains only digits {1,2,7}.

1, 11, 1489, 4596489, 4144600242739, 130834904430015239

Offset

1,2

Links

Table of n, a(n) for n=1..6.

P. De Geest, Squares containing at most three distinct digits, Index entries for related sequences

Hisanori Mishima, Sporadic tridigital solutions

Crossrefs

Cf. A053885.

Sequence in context: A160264 A351597 A076168 * A027880 A222841 A287035

Adjacent sequences: A053881 A053882 A053883 * A053885 A053886 A053887

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