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A104576 Indices of prime generalized tribonacci numbers, A001644. 6
2, 3, 4, 7, 8, 9, 10, 12, 20, 30, 33, 66, 76, 77, 82, 87, 98, 180, 205, 360, 553, 719, 766, 1390, 1879, 1999, 4033, 5620, 16506, 17436, 23676, 24428, 27758, 31932, 58199, 67661, 85040, 102023, 185595 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The sequence of generalized tribonacci numbers is defined as beginning with 1, 3, 7. Subsequent terms are the sum of the previous three terms. Note that the sequence of these generalized tribonacci numbers has many more primes than the tribonacci sequence A000073 (whose prime indices are in A092835).

a(40) > 2*10^5. - Robert Price, Dec 24 2013

LINKS

Table of n, a(n) for n=1..39.

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

CROSSREFS

Cf. A104577 (indices of prime generalized tetranacci numbers).

Sequence in context: A231003 A171551 A096199 * A031477 A047227 A317047

Adjacent sequences:  A104573 A104574 A104575 * A104577 A104578 A104579

KEYWORD

nonn

AUTHOR

T. D. Noe, Mar 16 2005

EXTENSIONS

a(37)-a(39) from Robert Price, Dec 24 2013

STATUS

approved

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Last modified November 17 08:39 EST 2019. Contains 329217 sequences. (Running on oeis4.)