A248757 Indices of prime Fibonacci 5-step numbers, A001591.

6, 10, 11, 28, 149, 172, 185, 754, 815, 1510, 1594, 3160, 3755, 10654, 12743, 71807, 155957

Offset

1,1

Comments

This sequence is similar to A105756 but uses the indexing scheme defined by A001591 whose indices start with 0.

a(18) > 2*10^5.

Links

Table of n, a(n) for n=1..17.

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, Fibonacci n-Step Number

Formula

a(n) = A105756 (n) + 3.

Mathematica

a = {0, 0, 0, 0, 1}; For[n = 5, n ≤ 1000, n++, sum = Plus @@ a;
  If[PrimeQ[sum], Print[n]]; a = RotateLeft[a]; a[[5]] = sum]

Crossrefs

Cf. A001591, A105756.

Sequence in context: A277597 A068442 A096549 * A136812 A109397 A133210

Adjacent sequences: A248754 A248755 A248756 * A248758 A248759 A248760

Keyword

nonn,more

Author

Robert Price, Oct 13 2014

Status

approved