A228140 Numbers n such that n^2 - 2 is not squarefree.

10, 39, 45, 58, 59, 88, 108, 116, 137, 156, 157, 186, 206, 235, 244, 255, 284, 304, 333, 334, 338, 353, 373, 382, 402, 414, 431, 451, 477, 480, 500, 529, 533, 549, 578, 598, 623, 627, 647, 665, 676, 685, 696, 717, 725, 745, 774, 794, 822, 823, 843, 845, 872, 892, 902, 912, 921, 941

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Formula

{n: A008865(n) in A013929} . - R. J. Mathar, Sep 26 2013

Maple

remove(n -> numtheory:-issqrfree(n^2-2), [$1..1000]); # Robert Israel, Nov 03 2019

Mathematica

Select[Range[1000], !SquareFreeQ[#^2-2]&] (* Harvey P. Dale, Jun 14 2021 *)

Crossrefs

Cf. A005117, A008865, A013929, A173186.

Sequence in context: A219823 A216591 A249707 * A156674 A360669 A022277

Adjacent sequences: A228137 A228138 A228139 * A228141 A228142 A228143

Keyword

nonn

Author

Gerasimov Sergey, Aug 12 2013

Extensions

Corrected by R. J. Mathar, Sep 26 2013

Status

approved