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A074698 Numbers n such that n divides the number of divisors of F(n), the n-th Fibonacci number. 1
1, 24, 48, 60, 64, 96, 128, 192, 256, 336, 384, 512, 576, 768, 1024, 1536, 1920, 2048, 3072 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Are all numbers of the form 2^k*24 and 2^k*64, k >= 0, in the sequence?

LINKS

Table of n, a(n) for n=1..19.

MAPLE

with(combinat): with(numtheory): a:=proc(n) if type(tau(fibonacci(n))/n, integer) then n fi end: seq(a(n), n=1..200); # Emeric Deutsch, Jan 30 2006

PROG

(PARI) isok(n) = ! (numdiv(fibonacci(n)) % n); \\ Michel Marcus, Sep 10 2017

CROSSREFS

Cf. A000005, A000045, A063375.

Sequence in context: A105651 A105779 A199105 * A292354 A257861 A050497

Adjacent sequences:  A074695 A074696 A074697 * A074699 A074700 A074701

KEYWORD

nonn,more

AUTHOR

Benoit Cloitre, Sep 03 2002

EXTENSIONS

a(9) from Emeric Deutsch, Jan 30 2006

a(10)-a(19) from Charles R Greathouse IV, Nov 07 2016

STATUS

approved

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Last modified October 20 20:24 EDT 2019. Contains 328273 sequences. (Running on oeis4.)