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 A139587 Non-Fibonacci numbers with non-Fibonacci number of divisors. 2
 6, 10, 12, 14, 15, 18, 20, 22, 26, 27, 28, 32, 33, 35, 36, 38, 39, 44, 45, 46, 48, 50, 51, 52, 57, 58, 60, 62, 63, 64, 65, 68, 69, 72, 74, 75, 76, 77, 80, 82, 84, 85, 86, 87, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 106, 108, 111 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A000005(a(n)) is not a Fibonacci number. LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE 6 belongs to the sequence because it is not a Fibonacci number and its number of divisors, 4, is also not a Fibonacci number. MATHEMATICA With[{fibs=Fibonacci[Range[12]]}, Select[Range[Max[fibs]], FreeQ[fibs, #] && FreeQ[fibs, DivisorSigma[0, #]]&]] (* Harvey P. Dale, Jun 20 2021 *) CROSSREFS Non-Fibonacci number: A001690. Cf. A000005, A000045, A139095, A139586, A139588, A139589, A139590. Sequence in context: A182301 A069059 A273157 * A201463 A119313 A362980 Adjacent sequences: A139584 A139585 A139586 * A139588 A139589 A139590 KEYWORD easy,nonn AUTHOR Omar E. Pol, May 22 2008 EXTENSIONS Example clarified by Harvey P. Dale, Jun 20 2021 STATUS approved

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Last modified June 18 07:40 EDT 2024. Contains 373469 sequences. (Running on oeis4.)