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A248700 Indices of primes in the Heptanacci numbers sequence A122189. 1

%I #21 Dec 04 2014 20:47:07

%S 8,14,22,102495,130447,173590

%N Indices of primes in the Heptanacci numbers sequence A122189.

%C a(7) > 2*10^5.

%H Tony D. Noe and Jonathan Vos Post, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL8/Noe/noe5.html">Primes in Fibonacci n-step and Lucas n-step Sequences</a>, J. of Integer Sequences, Vol. 8 (2005), Article 05.4.4

%t a={0,0,0,0,0,0,1}; For[n=7, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[7]]=sum]

%Y Cf. A001590, A001631, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523, A214825, A235862, A000288, A000322, A122189.

%K nonn,more

%O 1,1

%A _Robert Price_, Dec 02 2014

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)