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A077432
Squares of the form u'v'w, where in decimal representation u=n^2, v=2*n^2 and w=n^2 possibly with a leading zero.
3
121, 484, 91809, 163216, 255025, 367236, 499849, 64128064, 81162081, 100200100, 121242121, 144288144, 169338169, 196392196, 225450225, 256512256, 289578289, 324648324, 361722361, 400800400, 441882441, 484968484, 52910580529
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