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A063509
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Squarefree Lucas numbers.
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1
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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; internal format)
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OFFSET
| 0,1
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LINKS
| Harry J. Smith, Table of n, a(n) for n=0,...,200
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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 ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 24 2009]
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CROSSREFS
| Cf. A000032.
Sequence in context: A174254 A024404 A077173 * A137766 A010758 A019224
Adjacent sequences: A063506 A063507 A063508 * A063510 A063511 A063512
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KEYWORD
| nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Aug 09 2001
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EXTENSIONS
| More terms from Dean Hickerson, Aug 22 2001
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