A105764 Indices of prime Lucas 5-step numbers, A074048.

2, 3, 5, 7, 8, 9, 10, 13, 30, 35, 77, 98, 126, 160, 192, 810, 1086, 1999, 2021, 3157, 3426, 3471, 15066, 24115, 29782, 29941

Offset

1,1

Comments

No other n < 30000.

Links

Table of n, a(n) for n=1..26.

Tony D. Noe and Jonathan Vos Post, Primes in Fibonacci n-step and Lucas n-step Sequences, J. of Integer Sequences, Vol. 8 (2005), Article 05.4.4

Eric Weisstein's World of Mathematics, Lucas n-Step Number

Mathematica

a={-1, -1, -1, -1, 5}; lst={}; Do[s=Plus@@a; a=RotateLeft[a]; a[[ -1]]=s; If[PrimeQ[s], AppendTo[lst, n]], {n, 30000}]; lst

Crossrefs

Cf. A105765 (prime Lucas 5-step numbers).

Sequence in context: A111292 A047373 A039048 * A226811 A227802 A329780

Adjacent sequences: A105761 A105762 A105763 * A105765 A105766 A105767

Keyword

nonn

Author

T. D. Noe, Apr 22 2005

Status

approved