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A061359
a(1) = 1; a(n) = least number such that the concatenation a(n)a(n-1)...a(2)a(1) is a square.
14
1, 8, 16, 146, 22086, 31071113326, 365107058344463715696, 2684967738644586785227227090233956040549004, 809079884187716191997158821357206898310718837487307207657194711477350102495950972665
OFFSET
1,2
LINKS
Sean A. Irvine, Java program (github)
EXAMPLE
a(3)a(2)a(1) = 1681 = 41^2, a(4)a(3)a(2)a(1) = 1461681 = 1209^2.
CROSSREFS
Sequence in context: A107906 A328127 A323385 * A330150 A340586 A005445
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Apr 28 2001
EXTENSIONS
Corrected and extended by Larry Reeves (larryr(AT)acm.org), May 07 2001
More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Nov 06 2001
STATUS
approved