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A105764 Indices of prime Lucas 5-step numbers, A074048. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 13 18:37 EDT 2021. Contains 343868 sequences. (Running on oeis4.)