A023176 Numbers k such that Fibonacci(k) == 5 (mod k).

1, 2, 3, 5, 8, 10, 20, 21, 32, 55, 80, 95, 104, 145, 155, 165, 205, 247, 295, 305, 320, 355, 395, 437, 445, 505, 545, 605, 655, 667, 695, 745, 755, 895, 905, 955, 987, 995, 1055, 1145, 1195, 1205, 1255, 1345, 1355, 1405, 1435, 1555, 1615, 1655, 1705, 1745, 1795

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000045.

Programs

PARI

is(n)=((Mod([1,1;1,0],n))^n)[1,2]==5 \\ Charles R Greathouse IV, May 29 2013