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A067474 Smallest n-digit square starting with 4. 2
4, 49, 400, 4096, 40000, 400689, 4000000, 40005625, 400000000, 4000056516, 40000000000, 400000591936, 4000000000000, 40000008597136, 400000000000000, 4000000100766916, 40000000000000000, 400000001222314089 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..18.

FORMULA

a(n) = ceiling(sqrt(4*10^(n-1)))^2 - Rick L. Shepherd, Feb 18 2002

MATHEMATICA

nS[n_] := Module[{i = Floor[Sqrt[n]}, If[i^2==n, i^2, (i + 1)^2]]; Table[nS[4 10^i], {i, 0, 25}]

PROG

(PARI) for(n=1, 20, a=ceil(sqrt(4*10^(n-1)))^2; print(a))

CROSSREFS

Cf. A035071 (roots), A045787, A067479 (2..9).

Sequence in context: A224538 A064751 A045787 * A053769 A173038 A198971

Adjacent sequences:  A067471 A067472 A067473 * A067475 A067476 A067477

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Feb 09 2002

EXTENSIONS

More terms from Rick L. Shepherd, Feb 18 2002

STATUS

approved

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Last modified August 22 03:07 EDT 2017. Contains 290942 sequences.