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.

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.

Links

Table of n, a(n) for n=1..23.

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

Cf. A004216, A077430, A077431.

Sequence in context: A017390 A110722 A236181 * A017654 A183448 A296127

Adjacent sequences: A077429 A077430 A077431 * A077433 A077434 A077435

Keyword

nonn,base,nice

Author

Reinhard Zumkeller, Nov 05 2002

Status

approved