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A063509 Squarefree Lucas numbers. 2
2, 1, 3, 7, 11, 29, 47, 123, 199, 322, 521, 843, 2207, 3571, 9349, 15127, 39603, 64079, 103682, 167761, 271443, 1149851, 3010349, 4870847, 12752043, 20633239, 33385282, 54018521, 87403803, 228826127, 370248451, 969323029, 1568397607 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
MATHEMATICA
Select[LucasL[Range[0, 50]], SquareFreeQ] (* Harvey P. Dale, Jan 20 2020 *)
PROG
(PARI) for(n=0, 30, x=fibonacci(n)+2*fibonacci(n-1); if(issquarefree(x), print(x)))
(PARI) { n=-1; g=1; f=0; for (m=0, 10^9, if (issquarefree(a=f + 2*g), write("b063509.txt", n++, " ", a); if (n==200, break)); h=g; g=f; f+=h ) } \\ Harry J. Smith, Aug 24 2009
CROSSREFS
Cf. A000032.
Sequence in context: A174254 A024404 A077173 * A137766 A294620 A010758
KEYWORD
nonn
AUTHOR
Jason Earls, Aug 09 2001
EXTENSIONS
More terms from Dean Hickerson, Aug 22 2001
STATUS
approved

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Last modified July 14 05:06 EDT 2024. Contains 374291 sequences. (Running on oeis4.)