A067456 Floor( sqrt( sum of the decimal digits of n squared)).

1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 2, 2, 3, 4, 5, 6, 7, 8, 9, 3, 3, 3, 4, 5, 5, 6, 7, 8, 9, 4, 4, 4, 5, 5, 6, 7, 8, 8, 9, 5, 5, 5, 5, 6, 7, 7, 8, 9, 10, 6, 6, 6, 6, 7, 7, 8, 9, 10, 10, 7, 7, 7, 7, 8, 8, 9, 9, 10, 11, 8, 8, 8, 8, 8, 9, 10, 10, 11, 12, 9, 9, 9, 9, 9, 10, 10, 11

Offset

0,2

Comments

Terms from Robert G. Wilson v.

Links

Table of n, a(n) for n=0..96.

Formula

a(n) = floor(sqrt(A003132)).

Mathematica

Table[Floor[Sqrt[Apply[Plus, IntegerDigits[n]^2]]], {n, 1, 100}] (* Robert G. Wilson v *)

Crossrefs

Sequence in context: A133048 A214950 A054055 * A052429 A051802 A051801

Adjacent sequences: A067453 A067454 A067455 * A067457 A067458 A067459

Keyword

base,easy,nonn

Author

Amarnath Murthy, Feb 05 2002

Status

approved