login
A067478
Smallest n-digit square starting with 8.
2
81, 841, 8100, 80089, 801025, 8003241, 80013025, 800041225, 8000050249, 80000162649, 800001447184, 8000004951184, 80000001609984, 800000042569984, 8000000160998400, 80000000297200369, 800000000000150481, 8000000001435765625, 80000000000015048100
OFFSET
2,1
FORMULA
a(n) = ceiling(sqrt(8*10^(n-1)))^2. - Sascha Kurz, Mar 18 2002
MATHEMATICA
nS[n_] := Module[{lr = Floor[Sqrt[n]]}, If[lr^2==n, lr^2, (lr + 1)^2]]; Table[nS[8 10^i], {i, 0, 20}]
CROSSREFS
Cf. A000290, A035075 (roots), A045791, A067479 (2..9).
Sequence in context: A247842 A273233 A045792 * A076749 A222995 A173810
KEYWORD
nonn,base,easy
AUTHOR
Amarnath Murthy, Feb 09 2002
EXTENSIONS
More terms from Harvey P. Dale, Feb 17 2002
Incorrect a(1) removed by Jon E. Schoenfield, Mar 21 2021
STATUS
approved