login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A274584 Composite numbers n such that primitive part of Fibonacci(n) is prime. 1
4, 8, 9, 10, 14, 15, 16, 18, 20, 21, 22, 26, 28, 30, 32, 33, 34, 35, 38, 39, 40, 42, 45, 51, 52, 54, 60, 62, 63, 65, 66, 72, 74, 75, 76, 82, 93, 94, 98, 105, 106, 111, 112, 119, 121, 122, 123, 124, 132, 135, 136, 140, 142, 144, 145, 152, 156, 158, 160, 172, 180 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
For every n > 1, A105602(a(n)) > 1.
LINKS
Arkadiusz Wesolowski, Table of n, a(n) for n = 1..350
C. K. Caldwell, Top Twenty page, Fibonacci Primitive Part
PROG
(Magma) lst:=[]; for n in [4..180] do if not IsPrime(n) then d:=Divisors(n); p:=Truncate(&*[Fibonacci(d[i])^MoebiusMu(Truncate(n/d[i])): i in [1..#d]]); if IsPrime(p) then Append(~lst, n); end if; end if; end for; lst;
CROSSREFS
Cf. A061446. Supersequence of A061254.
Sequence in context: A144754 A080970 A288862 * A210998 A205524 A125493
KEYWORD
nonn
AUTHOR
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 18 03:01 EDT 2024. Contains 371767 sequences. (Running on oeis4.)