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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: 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

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Last modified March 3 13:27 EST 2024. Contains 370512 sequences. (Running on oeis4.)