OFFSET
1,2
LINKS
Zhao Hui Du, Table of n, a(n) for n = 1..15
Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences
H. Mishima, Sporadic tridigital solutions
FORMULA
a(n) = A053890(n)^2.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Mar 15 2000
EXTENSIONS
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
One more term from Jon E. Schoenfield, Sep 03 2006
Two more terms from Mishima's page added by Max Alekseyev, Jan 28 2012
STATUS
approved