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 A068833 Start of the first occurrence of exactly n consecutive squares with digit sum also a square. 2
 16, 36, 900, 3364, 0, 123409881, 10000, 81, 2120219933855716, 91361386718598177458046950625 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..9. EXAMPLE a(7) = 81 as the sums of the digits of the 7 consecutive squares 81, 100, 121, 144, 169, 196, 225 are squares, but the digit sums of 64 and 256 are not. MATHEMATICA l[n_] := Module[{k}, For[k=0, IntegerQ[Sqrt[Plus@@IntegerDigits[(n+k)^2]]], k++, Null]; k]; Clear[a]; For[n=0, True, n+=ln+1, If[a[ln=l[n]]==-1, Null, Null, a[ln]=n; Print["a(", ln, ")=", n^2]]] CROSSREFS Cf. A061910, A293832. Sequence in context: A218523 A300535 A053893 * A116190 A070587 A350288 Adjacent sequences: A068830 A068831 A068832 * A068834 A068835 A068836 KEYWORD hard,more,nonn,base AUTHOR Amarnath Murthy, Mar 09 2002 EXTENSIONS Edited by Dean Hickerson, Oct 28 2002 a(9) from Giovanni Resta, Aug 27 2018 STATUS approved

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Last modified August 15 00:19 EDT 2024. Contains 375171 sequences. (Running on oeis4.)