A030691 Cube root of A030690.

5, 16, 21, 55, 63, 154, 17, 40, 201, 10, 23, 113, 257, 27, 609, 295, 307, 148, 1535, 342, 164, 1692, 809, 1793, 397, 878, 90, 428, 944, 4482, 987, 1008, 1029, 4872, 107, 2349, 5154, 5247, 2478, 252, 552, 5609, 5697, 5785, 2726, 1284, 2806, 6131

Offset

1,1

Comments

Smallest m such that m^3 begins with n^2.

Links

Zak Seidov, Table of n, a(n) for n = 1..1000

Example

a(4)=55 because 55^3=166375 begins with 4^2=16. - Zak Seidov, Oct 18 2011

Mathematica

s={}; Do[If[n==3, AppendTo[s, 21], k=1; While[(ra=Range[Ceiling[(n^2*10^k)^(1/3)], Floor[((n^2+1)*10^k)^(1/3)]]) == {}, k++]; AppendTo[s, ra[[1]]]], {n, 100}]; s (* Zak Seidov, Oct 18 2011 *)

Crossrefs

Sequence in context: A077469 A022140 A041855 * A041107 A042603 A031120

Adjacent sequences: A030688 A030689 A030690 * A030692 A030693 A030694

Keyword

nonn,base

Author

Patrick De Geest

Status

approved