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A061361 a(1) = 4; a(n) = least number such that the concatenation a(n)a(n-1)...a(2)a(1) is a square. 6
4, 6, 17, 604, 9612, 85848855, 109457393440691436, 16484027824615378535694780556419522, 2537811713051483817817710620248313487995814710180147690293469081793581 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 23 13:57 EST 2014. Contains 249851 sequences.