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A068833
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Start of the first occurrence of exactly n consecutive squares with digit sum also a square.
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1
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OFFSET
| 0,1
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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.
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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]]]
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CROSSREFS
| Sequence in context: A076956 A075369 A053893 * A116190 A070587 A070586
Adjacent sequences: A068830 A068831 A068832 * A068834 A068835 A068836
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KEYWORD
| hard,more,nonn,base
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 09 2002
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EXTENSIONS
| Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Oct 28 2002
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