A067472 Smallest n-digit square starting with 2.

25, 225, 2025, 20164, 200704, 2002225, 20007729, 200024449, 2000057284, 20000182084, 200000361796, 2000001237796, 20000000402496, 200000010642496, 2000000040249600, 20000000215721449, 200000000447251216

Offset

2,1

Links

Table of n, a(n) for n=2..18.

Formula

a(n) = ceiling(sqrt(2*10^(n-1)))^2, n>1. - Rick L. Shepherd, Feb 14 2002

Mathematica

Table[Ceiling[Sqrt[2*10^(n-1)]]^2, {n, 2, 30}] (* Harvey P. Dale, Apr 18 2021 *)

Prog

(PARI) for(n=2, 25, a=ceil(sqrt(2*10^(n-1)))^2; print(a))

Crossrefs

Cf. A035069 (roots), A045785, A067479 (2..9).

Sequence in context: A288876 A065779 A095241 * A058426 A189275 A048384

Adjacent sequences: A067469 A067470 A067471 * A067473 A067474 A067475

Keyword

base,easy,nonn

Author

Amarnath Murthy, Feb 09 2002

Extensions

More terms from Rick L. Shepherd, Feb 14 2002

Status

approved