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A117290
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Numbers n for which the cototient n-phi(n) is a Fibonacci number.
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0
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2, 3, 4, 5, 7, 9, 11, 12, 13, 14, 16, 17, 19, 23, 25, 29, 31, 33, 37, 41, 43, 45, 47, 53, 57, 59, 61, 67, 71, 73, 79, 83, 85, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 159, 163, 167, 169, 173, 175, 179, 181, 191, 193, 197, 199, 211, 216, 223
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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EXAMPLE
| 33 is in the sequence because 33-phi(33)=13, which is a Fibonacci number.
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MATHEMATICA
| With[{fibs=Fibonacci[Range[13]]}, Select[Range[fibs[[-1]]], MemberQ[fibs, #-EulerPhi[#]]&]] [From Harvey P. Dale, Jan 28 2011]
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CROSSREFS
| Cf. A000045.
Sequence in context: A055600 A139528 A178434 * A188551 A045782 A184112
Adjacent sequences: A117287 A117288 A117289 * A117291 A117292 A117293
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KEYWORD
| nonn
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AUTHOR
| Luc Stevens (lms022(AT)yahoo.com), Apr 23 2006
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