OFFSET
1,3
EXAMPLE
1521=39^2, number of digits = 4, number of digits = 1+5+2+1=9.
PROG
(PARI) isok(n) = issquare(n) && issquare(sumdigits(n)) && issquare(length(Str(n))); \\ Michel Marcus, Oct 15 2013
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Zak Seidov, Nov 19 2009
STATUS
approved