

A061361


a(1) = 4; a(n) = least number such that the concatenation a(n)a(n1)...a(2)a(1) is a square.


6




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..9.


EXAMPLE

a(3)a(2)a(1) = 1764 = 42^2, a(4)a(3)a(2)a(1) = 6041764 = 2458^2, a(5)a(4)a(3)a(2)a(1) = 8584885596126041764 = 2929997542^2.


CROSSREFS

Cf. A050636, A050637, A061359, A061363.
Sequence in context: A125691 A211949 A079803 * A113610 A062046 A102020
Adjacent sequences: A061358 A061359 A061360 * A061362 A061363 A061364


KEYWORD

nonn,base


AUTHOR

Amarnath Murthy, Apr 28 2001


EXTENSIONS

Corrected by Larry Reeves (larryr(AT)acm.org), May 07 2001
More terms from UlrSchimke(AT)aol.com, Nov 06, 2001


STATUS

approved



