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A137563
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Fibonacci numbers with three distinct prime divisors.
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1
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610, 987, 2584, 10946, 3524578, 9227465, 24157817, 39088169, 63245986, 1836311903, 7778742049, 20365011074, 591286729879, 4052739537881, 17167680177565, 44945570212853, 61305790721611591, 420196140727489673, 1500520536206896083277, 6356306993006846248183
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Ron Knott, Fibonacci Numbers.
Ron Knott, Prime divisors of Fibonacci numbers.
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EXAMPLE
| The distinct prime divisors of the Fibonacci number 610 are 2, 5 and 61.
The distinct prime divisors of the Fibonacci number 44945570212853 are 269,116849 and 1429913.
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MAPLE
| with(numtheory): with(combinat): a:=proc(n) if nops(factorset(fibonacci(n)))= 3 then fibonacci(n) else end if end proc: seq(a(n), n=1..110); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 18 2008
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MATHEMATICA
| Select[Fibonacci[Range[200]], Last/@FactorInteger[#]=={1, 1, 1}&] (* From Vladimir Joseph Stephan Orlovsky, Feb 03 2012 *)
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CROSSREFS
| Cf. A000045, A053409.
Sequence in context: A187421 A186213 A027514 * A204487 A090177 A120719
Adjacent sequences: A137560 A137561 A137562 * A137564 A137565 A137566
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KEYWORD
| nonn,changed
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 25 2008
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 18 2008
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