A053915 Squares composed of digits {1,8,9}.

1, 9, 81, 11881, 19881, 111999889, 1199998881, 1981191998999889, 11181188899981881, 889111189818189198888889, 18891818199881191889889889, 8819999189981919818818919999881

Offset

1,2

Links

Table of n, a(n) for n=1..12.

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

Author?, Source, (txt)

H. Mishima, Sporadic tridigital solutions

Formula

a(n) = A053914(n)^2.

Crossrefs

Cf. A053914.

Sequence in context: A203107 A168493 A003302 * A067216 A076088 A061211

Adjacent sequences: A053912 A053913 A053914 * A053916 A053917 A053918

Keyword

nonn,base,more

Author

Patrick De Geest, Mar 15 2000

Extensions

One more term from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005

One more term from Jon E. Schoenfield, Sep 03 2006

One more term from Mishima's webpage added by Max Alekseyev, Jan 28 2012

Status

approved