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Search: id:A114823
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| A114823 |
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Indices of Fibonacci numbers with 13 distinct prime factors. |
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+0
4
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| 120, 200, 220, 228, 260, 368, 392, 405, 414, 434, 472, 492, 512, 536, 584, 585, 595, 610, 615, 618, 645, 654, 693, 741, 762, 777, 830, 867, 894, 904, 931, 942, 957, 962, 978
(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)=120 because 120th fibonacci number(i.e. 5358359254990966640871840) consists of 13 distinct prime factors (i.e. 2^5 * 3^2 * 5 * 7 * 11 * 23 * 31 * 41 * 61 * 241 * 2161 * 2521 * 20641)
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PROGRAM
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(PARI) n=1; while(n<265, if(omega(fibonacci(n))==13, print1(n, ", ")); n++)
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CROSSREFS
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Sequence in context: A023197 A054572 A056994 this_sequence A069790 A064224 A069674
Adjacent sequences: A114820 A114821 A114822 this_sequence A114824 A114825 A114826
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KEYWORD
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hard,more,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 Ryan Propper (rpropper(AT)stanford.edu), Apr 26 2006
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