OFFSET
1,1
COMMENTS
FORMULA
a(n) = A016069(n)^2.
EXAMPLE
69696 is in the sequence because 69696 = 264^2 and 69696 contains exactly two different digits: 6 and 9.
PROG
(PARI) s=[]; for(n=1, 10000, if(#vecsort(eval(Vec(Str(n^2))), , 8)==2, s=concat(s, n^2))); s
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Colin Barker, Jan 15 2014
STATUS
approved