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 A048345 a(n)^2 is the smallest square containing exactly n 0's. 1
 0, 10, 320, 100, 3200, 1000, 32000, 10000, 320000, 100000, 3200000, 1000000, 32000000, 10000000, 320000000, 100000000, 3200000000, 1000000000, 32000000000, 10000000000, 320000000000, 100000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..22. Eric Weisstein's World of Mathematics, Square Number Index entries for linear recurrences with constant coefficients, signature (0,10). FORMULA From Ralf Stephan, Jul 18 2013: (Start) a(n) = 10*a(n-2); a(0)=0, a(1)=10, a(2)=320. G.f.: (10*x + 320*x^2)/(1-10*x^2). (End) MATHEMATICA LinearRecurrence[{0, 10}, {0, 10, 320}, 30] (* Harvey P. Dale, Feb 10 2022 *) PROG (Magma) a:=[0, 10, 320]; [n le 3 select a[n] else 10*Self(n-2):n in [1..25]]; // Marius A. Burtea, Oct 11 2019 CROSSREFS Cf. A000290, A036507. Sequence in context: A302933 A372729 A180584 * A325726 A223298 A164055 Adjacent sequences: A048342 A048343 A048344 * A048346 A048347 A048348 KEYWORD nonn,base,easy AUTHOR Patrick De Geest, Mar 15 1999 EXTENSIONS More terms from Lior Manor, Jul 02 2001 a(20) corrected by Georg Fischer, Dec 07 2019 STATUS approved

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Last modified August 15 13:43 EDT 2024. Contains 375173 sequences. (Running on oeis4.)