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Search: id:A074317
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| A074317 |
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Deficient Fibonacci numbers. |
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+0
1
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| 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 233, 377, 610, 987, 1597, 4181, 6765, 10946, 17711, 28657, 75025, 121393, 196418, 317811, 514229, 1346269, 2178309, 3524578, 5702887, 9227465, 24157817, 39088169, 63245986, 165580141, 433494437
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OFFSET
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1,2
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EXAMPLE
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a(9)=55 is a term because sum of aliquot divisors of 55( which is a fibonacci number)i.e. 1+5+11=17 is less than 55.
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MATHEMATICA
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DeficientQ[n_]:=DivisorSigma[1, n]<2n; a={}; Do[f=Fibonacci[n]; If[DeficientQ[f], AppendTo[a, f]], {n, 1, 10^2, 1}]; a (Vladimir Orlovsky, Jul 25 2008)
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CROSSREFS
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Sequence in context: A069041 A109609 A073958 this_sequence A077371 A077372 A147659
Adjacent sequences: A074314 A074315 A074316 this_sequence A074318 A074319 A074320
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KEYWORD
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base,hard,nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Sep 22 2002
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