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A247096
Numbers n such that (n^2 - 2) and (n^2 + 2) are not squarefree.
1
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
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
Sequence in context: A259082 A366457 A105326 * A276186 A346807 A129546
KEYWORD
nonn
AUTHOR
STATUS
approved