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Search: id:A038524
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| A038524 |
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Numbers n such that the n-th Fibonacci number is composite and the concatenation of its prime factors (written in base 10 in ascending order) is prime. |
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+0
1
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| 8, 24, 28, 34, 50, 52, 58, 71, 77, 163, 197, 235, 238, 319, 570, 669, 949, 958
(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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F(24) = 46368 = 2^5 * 3^2 * 7 * 23 is composite, and the concatenation 2222233723 is prime, so 24 is in the sequence.
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CROSSREFS
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Sequence in context: A029607 A048109 A068781 this_sequence A000118 A096727 A028660
Adjacent sequences: A038521 A038522 A038523 this_sequence A038525 A038526 A038527
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KEYWORD
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hard,base,nonn
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AUTHOR
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Jeff Burch (gburch(AT)erols.com)
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EXTENSIONS
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More terms from Jens Kruse Andersen (jens.k.a(AT)get2net.dk), Jan 05 2003
949 and 958 established as next two terms by Ryan Propper (rpropper(AT)stanford.edu), May 29 2006
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