A067124 Floor [sqrt{concatenation of first n squares}].

1, 3, 12, 122, 1221, 12213, 122132, 1221321, 12213211, 386215660, 12213211555, 386215660604, 12213211555380, 386215660604902, 12213211555380554, 386215660604902322, 12213211555380554371, 386215660604902322908

Offset

1,2

Links

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

Example

a(6) = floor[ sqrt{149162536}] = 12213.

Mathematica

Table[Floor[Sqrt[FromDigits[Flatten[IntegerDigits/@(Range[n]^2)]]]], {n, 20}] (* Harvey P. Dale, Jun 29 2025 *)

Crossrefs

Sequence in context: A133553 A010571 A280248 * A208937 A209065 A124153

Adjacent sequences: A067121 A067122 A067123 * A067125 A067126 A067127

Keyword

easy,nonn,base

Author

Amarnath Murthy, Jan 08 2002

Extensions

Edited by Charles R Greathouse IV, Apr 27 2010

Status

approved