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Search: id:A114839
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| A114839 |
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Indices of Fibonacci numbers with 6 distinct prime factors. |
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+0
1
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| 40, 48, 54, 56, 64, 78, 92, 95, 99, 102, 116, 117, 129, 133, 155, 159, 175, 177, 188, 194, 205, 206, 219, 237, 245, 265, 278, 314, 323, 327, 339, 341, 343, 346, 356, 358, 361, 362, 394, 407, 411, 417, 422, 427, 437, 446, 454, 466, 482, 502, 503, 505, 514, 515
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Blair Kelly, Fibonacci and Lucas Factorizations.
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EXAMPLE
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a(1)=40 because 40th fibonacci number consists of 6 distinct prime factors (i.e. 102334155 = 3 x 5 x 7 x 11 x 41 x 2161)
a(31) = 341 because F(341)= 89 * 557 * 2417 * 761227665342913 * 197907695243868721 * 4558282384863830955384586674337 has exactly 6 prime factors.
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PROGRAM
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(PARI) n=1; while(n<330, if(omega(fibonacci(n))==6, print1(n, ", ")); n++)
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CROSSREFS
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Numbers n such that A000045(n) is in A046306.
Sequence in context: A095497 A046429 A046796 this_sequence A120382 A062909 A012871
Adjacent sequences: A114836 A114837 A114838 this_sequence A114840 A114841 A114842
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KEYWORD
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nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Feb 19 2006
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EXTENSIONS
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More terms from Jonathan Vos Post (jvospost3(AT)gmail.com), Mar 22 2006
Corrected by Ryan Propper (rpropper(AT)stanford.edu), Apr 26 2006
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