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A135954
(Nonprime Fibonacci numbers with prime indices, A050937) which have exactly 3 prime factors.
7
24157817, 44945570212853, 1500520536206896083277, 50095301248058391139327916261, 11463113765491467695340528626429782121, 3001082145496345390753066714782948988
OFFSET
1,1
COMMENTS
Conjecture: All numbers in this sequence are products of three sums of two squares.
MATHEMATICA
k = {}; Do[If[ !PrimeQ[Fibonacci[Prime[n]]], c = Length[FactorInteger[Fibonacci[Prime[n]]]]; If[c == 3, AppendTo[k, Fibonacci[Prime[n]]]]], {n, 1, 50}]; k
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 08 2007
STATUS
approved