A247096 Numbers n such that (n^2 - 2) and (n^2 + 2) are not squarefree.

58, 59, 157, 284, 338, 373, 382, 500, 598, 725, 745, 823, 843, 941, 1039, 1111, 1166, 1201, 1264, 1382, 1400, 1480, 1490, 1607, 1705, 1732, 1823, 1921, 1999, 2038, 2048, 2146, 2264, 2272, 2362, 2489, 2587, 2686, 2705, 2767, 2803, 2930, 3028, 3146, 3244, 3371, 3469, 3547, 3587, 3685, 3712

Offset

1,1

Comments

Intersection of A227897 and A228140.

Primes: 59, 157, 373, 823, 941, 1039, 1201, 1607, 1823, 1999, 2767, 2803, 3371, 3469, 3547, ...

Links

Colin Barker, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[4000], ! SquareFreeQ[#^2 - 2] && ! SquareFreeQ[#^2 + 2] &] (* Vincenzo Librandi, Nov 18 2014 *)

Prog

(Magma) [n: n in [1..4000] | not IsSquarefree(n^2 - 2) and not IsSquarefree(n^2 + 2)];
(PARI) select(n->!issquarefree(n^2-2) && !issquarefree(n^2+2), vector(4000, n, n)) \\ Colin Barker, Nov 18 2014

Crossrefs

Cf. A227897, A228140.

Sequence in context: A259082 A366457 A105326 * A276186 A346807 A129546

Adjacent sequences: A247093 A247094 A247095 * A247097 A247098 A247099

Keyword

nonn

Author

Juri-Stepan Gerasimov, Nov 18 2014

Status

approved