A094412 -id:A094412 - cp's OEIS frontend

A094411 Composite numbers k that divide both Fibonacci(k+1) and Fibonacci(k) + 1.

5777, 10877, 75077, 80189, 100127, 113573, 161027, 162133, 231703, 430127, 618449, 635627, 667589, 851927, 1033997, 1106327, 1256293, 1388903, 1697183, 2263127, 2435423, 2512889, 2662277, 3175883, 3399527, 3452147, 3774377

Offset: 1

Eric Rowland, May 01 2004

Also composites k that divide both Fibonacci(k+1) and Lucas(k) - 1. - Gary Detlefs, Feb 28 2013

Giovanni Resta, Table of n, a(n) for n = 1..548 (terms < 4*10^9)

Cf. A000032, A000045, A002808, A069107, A094395, A094401, A094412.

Select[Range[2, 50000], ! PrimeQ[ # ] && Mod[Fibonacci[ # + 1], # ] == 0 && Mod[Fibonacci[ # ] + 1, # ] == 0 &]

More terms from Gareth McCaughan, Jun 11 2004
More terms from Ryan Propper, Aug 04 2005
Offset corrected by Giovanni Resta, Jul 20 2013

A094413 Odd composites k that divide Fibonacci(k) + 1 but not Fibonacci(k+1).

Original entry on oeis.org

17261, 120581, 163059, 300847, 1842581, 3489641, 3792541, 5573499, 21159271, 36561959, 40779991, 63055651, 67306519, 69503037, 72125899, 129487163, 136021717, 174008141, 175094767, 247600477, 418623283, 529281911, 814454381, 902315699

Offset: 1

Eric Rowland, May 07 2004

nonn

David Radcliffe, Table of n, a(n) for n = 1..33 (first 24 terms from G. Resta)

Cf. A094395, A094411, A094412.

isok(n) = (n % 2) && ! ((fibonacci(n) + 1) % n) && (fibonacci(n+1) % n); \\ Michel Marcus, Aug 27 2013

4 more terms from Ryan Propper, Aug 03 2005

a(9)-a(24) from Giovanni Resta, Jul 20 2013

cp's OEIS Frontend

A094411 Composite numbers k that divide both Fibonacci(k+1) and Fibonacci(k) + 1.

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