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A128217 Nonnegative integers n such that the square-root of n differs from its nearest integer by less than 1/4. 1
0, 1, 4, 5, 8, 9, 10, 15, 16, 17, 18, 23, 24, 25, 26, 27, 34, 35, 36, 37, 38, 39, 46, 47, 48, 49, 50, 51, 52, 61, 62, 63, 64, 65, 66, 67, 68, 77, 78, 79, 80, 81, 82, 83, 84, 85, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

MATHEMATICA

nsrQ[n_]:=Module[{sr=Sqrt[n]}, Abs[First[sr-Nearest[{Floor[sr], Ceiling[sr]}, sr]]]<1/4]; Select[Range[0, 150], nsrQ] (* From Harvey P. Dale, Aug 19 2011 *)

CROSSREFS

Cf. A063656. See the first differences in A128218.

Sequence in context: A104883 A154885 A042956 * A190671 A042948 A126001

Adjacent sequences:  A128214 A128215 A128216 * A128218 A128219 A128220

KEYWORD

nonn

AUTHOR

John W. Layman (layman(AT)math.vt.edu), Feb 19 2007

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Last modified February 15 08:20 EST 2012. Contains 205729 sequences.