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A167035 Squares that remain squares if prefixed with a 1. 4
225, 5625, 22500, 562500, 2250000, 5405625, 23765625, 56250000, 225000000, 540562500, 2127515625, 2376562500, 5625000000, 22500000000, 54056250000, 58503515625, 212751562500, 237656250000, 562500000000, 2250000000000, 5405625000000, 5850351562500 (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

225 = 15^2 is a square and becomes the square 1225 = 35^2 if a 1 is attached in front.

MAPLE

P:=proc(i) local a, n; for n from 1 by 1 to i do a:=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: A218813 A330819 A297760 * A167042 A242268 A164763

Adjacent sequences:  A167032 A167033 A167034 * A167036 A167037 A167038

KEYWORD

base,nonn

AUTHOR

Claudio Meller, Oct 27 2009

EXTENSIONS

Comment turned into example by R. J. Mathar, Oct 28 2009

More terms from Chai Wah Wu, Sep 11 2014

STATUS

approved

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Last modified May 23 01:52 EDT 2022. Contains 353959 sequences. (Running on oeis4.)