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Search: id:A067474
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| A067474 |
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Smallest n-digit square starting with 4. |
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+0
3
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| 4, 49, 400, 4096, 40000, 400689, 4000000, 40005625, 400000000, 4000056516, 40000000000, 400000591936, 4000000000000, 40000008597136, 400000000000000, 4000000100766916, 40000000000000000, 400000001222314089
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = ceiling(sqrt(4*10^(n-1)))^2 - Rick L. Shepherd (rshepherd2(AT)hotmail.com), Feb 18 2002
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MATHEMATICA
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nS[n_] := Module[{i = Floor[Sqrt[n]}, If[i^2==n, i^2, (i + 1)^2]]; Table[nS[4 10^i], {i, 0, 25}]
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PROGRAM
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(PARI) for(n=1, 20, a=ceil(sqrt(4*10^(n-1)))^2; print(a))
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CROSSREFS
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Cf. A035071 (roots), A045787, A067479 (2..9).
Adjacent sequences: A067471 A067472 A067473 this_sequence A067475 A067476 A067477
Sequence in context: A113525 A064751 A045787 this_sequence A053769 A086094 A055793
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 09 2002
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Feb 18 2002
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