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A167044 Squares that remain squares when prefixed with a 9. 3
3025, 50625, 70225, 302500, 455625, 765625, 2640625, 5062500, 7022500, 30250000, 45562500, 76562500, 264062500, 506250000, 702250000, 3025000000, 4556250000, 7656250000, 26406250000, 34363890625, 50625000000, 70225000000, 302500000000, 455625000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..1000

EXAMPLE

3025=55^2 is a square and becomes the square 93025=305^2 if a 9 is attached in front of the decimal representation.

MAPLE

P:=proc(i) local a, n; for n from 1 by 1 to i do a:=9*10^floor(1+log10(n^2))+n^2; if a=trunc(sqrt(a))^2 then print(n^2); fi; od; end: P(10000000000000); # Paolo P. Lava, Nov 02 2009

CROSSREFS

Sequence in context: A231762 A034600 A225996 * A221249 A038544 A252142

Adjacent sequences:  A167041 A167042 A167043 * A167045 A167046 A167047

KEYWORD

nonn,base

AUTHOR

Claudio Meller, Oct 27 2009

EXTENSIONS

Keyword:base added by R. J. Mathar, Oct 28 2009

STATUS

approved

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Last modified May 23 18:08 EDT 2022. Contains 353993 sequences. (Running on oeis4.)