OFFSET
1,1
COMMENTS
a(n) = A077431(n)^2.
FORMULA
a(n) = (n*(1 + 10^(1 + floor(log_10(2*n^2)))))^2.
EXAMPLE
n=42, n^2=1764 and 2*n^2=3528: a(42) = 1764'3528'1764 = 420042^2 = A077431(42)^2.
CROSSREFS
KEYWORD
nonn,base,nice
AUTHOR
Reinhard Zumkeller, Nov 05 2002
STATUS
approved