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A138393 Numbers of form 8k+1 which are not squares. 1
17, 33, 41, 57, 65, 73, 89, 97, 105, 113, 129, 137, 145, 153, 161, 177, 185, 193, 201, 209, 217, 233, 241, 249, 257, 265, 273, 281, 297, 305, 313, 321, 329, 337, 345, 353, 369, 377, 385, 393, 401, 409, 417, 425, 433, 449, 457, 465, 473, 481, 489, 497, 505 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..53.

MATHEMATICA

a = {}; Do[If[Sqrt[8k + 1] == Floor[Sqrt[8k + 1]], [null], AppendTo[a, 8k + 1]], {k, 0, 100}]; a

Select[8*Range[80]+1, !IntegerQ[Sqrt[#]]&] (* Harvey P. Dale, May 03 2018 *)

CROSSREFS

Cf. A004768, A017077.

Sequence in context: A085255 A283395 A244752 * A044062 A044443 A158057

Adjacent sequences:  A138390 A138391 A138392 * A138394 A138395 A138396

KEYWORD

nonn

AUTHOR

Artur Jasinski, Mar 18 2008

STATUS

approved

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Last modified November 16 22:20 EST 2019. Contains 329208 sequences. (Running on oeis4.)