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 A104577 Indices of prime generalized tetranacci numbers, A073817. 5
 2, 3, 8, 9, 16, 19, 24, 27, 46, 68, 71, 78, 107, 198, 309, 377, 477, 1057, 1631, 2419, 3974, 4293, 8247, 10513, 10709, 12011, 15042, 30543, 31607, 39664, 47552, 145858 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence of generalized tetranacci numbers is defined as beginning with 1, 3, 7, 15. Subsequent terms are the sum of the previous four terms. Note that the sequence of these generalized tetranacci numbers has many more primes than the tetranacci sequence A000078 (whose prime indices are in A104534). LINKS Table of n, a(n) for n=1..32. 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 MATHEMATICA a={-1, -1, -1, 4}; Do[s=Plus@@a; a=RotateLeft[a]; a[[4]]=s; If[PrimeQ[s], Print[n]], {n, 30000}] CROSSREFS Cf. A104576 (indices of prime generalized tribonacci numbers). Sequence in context: A331821 A093765 A260020 * A309017 A247375 A282508 Adjacent sequences: A104574 A104575 A104576 * A104578 A104579 A104580 KEYWORD nonn AUTHOR T. D. Noe, Mar 16 2005 STATUS approved

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Last modified June 6 06:26 EDT 2023. Contains 363139 sequences. (Running on oeis4.)