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Search: id:A099954
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| A099954 |
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Numbers n such that Fibonacci(n) is a semiprime and its reversal is a different semiprime. |
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+0
1
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OFFSET
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1,1
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EXAMPLE
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F(19) = 4181 = 37 * 113, Reverse[F(19)] = 1814 = 2 * 907.
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MAPLE
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with(combinat): with(numtheory): rev:=proc(n) local nn: nn:=convert(n, base, 10): add(nn[nops(nn)+1-j]*10^(j-1), j=1..nops(nn)) end: a:=proc(n): if rev(fibonacci(n))<>fibonacci(n) and bigomega(fibonacci(n))=2 and bigomega(rev(fibonacci(n)))=2 then n else fi end: seq(a(n), n=1..200); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 26 2006
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CROSSREFS
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Intersection of A000045 and A097393.
Adjacent sequences: A099951 A099952 A099953 this_sequence A099955 A099956 A099957
Sequence in context: A113868 A023152 A056025 this_sequence A050955 A072305 A095222
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KEYWORD
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nonn,base,more
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AUTHOR
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Jonathan Vos Post (jvospost2(AT)yahoo.com) and G. L. Honaker, Jr. (honak3r(AT)bvunet.net), Nov 13 2004
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 26 2006
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