login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A094410 Numbers n such that n divides Fibonacci(n-1) but does not divide Fibonacci(n) - 1. 2
442, 1891, 6601, 8149, 13981, 17119, 17711, 30889, 40501, 52701, 68101, 78409, 88601, 88831, 115231, 138601, 145351, 150121, 153781, 191351, 199801, 218791, 265881, 266071, 316561, 332949, 342271, 348517, 407353, 453151, 456301, 464101 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[50000], ! Mod[Fibonacci[ # ] - 1, # ] == 0 && Mod[Fibonacci[ # - 1], # ] == 0 &]

PROG

(PARI) fibmod(n, m)=(Mod([0, 1; 1, 1], m)^n*[0; 1])[1, 1]

is(n)=fibmod(n-1, n)==0 && fibmod(n, n)!=1 \\ Charles R Greathouse IV, Nov 04 2016

CROSSREFS

Cf. A069106, A094394, A094409.

Sequence in context: A158322 A031720 A069106 * A236706 A105922 A250086

Adjacent sequences:  A094407 A094408 A094409 * A094411 A094412 A094413

KEYWORD

nonn

AUTHOR

Eric Rowland, May 01 2004

EXTENSIONS

More terms from David Wasserman, May 08 2007

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 9 19:51 EST 2019. Contains 329879 sequences. (Running on oeis4.)