

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: A270270 A211949 A079803 * A332986 A113610 A309334
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 Ulrich Schimke (ulrschimke(AT)aol.com), Nov 06 2001


STATUS

approved



