A067478 Smallest n-digit square starting with 8.

81, 841, 8100, 80089, 801025, 8003241, 80013025, 800041225, 8000050249, 80000162649, 800001447184, 8000004951184, 80000001609984, 800000042569984, 8000000160998400, 80000000297200369, 800000000000150481, 8000000001435765625, 80000000000015048100

Offset

2,1

Links

Table of n, a(n) for n=2..20.

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

Adjacent sequences: A067475 A067476 A067477 * A067479 A067480 A067481

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