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 A092836 Prime tribonacci numbers. 9
 2, 7, 13, 149, 19341322569415713958901, 15762679542071167858843489, 145082467753351661438130501937754420584096000083183992629 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The next term has 212 digits and is too large to fit. - Harvey P. Dale, Oct 08 2017 These primes are A000073(k) at k = 4, 6, 7, 11, 87, 98, 215, 802, 4202, ... The indices in A092835 are off by one. - R. J. Mathar, Dec 14 2011 LINKS Harry J. Smith, Table of n, a(n) for n = 1..8 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, Tribonacci Number MATHEMATICA Select[LinearRecurrence[{1, 1, 1}, {0, 0, 1}, 1000], PrimeQ] (* Harvey P. Dale, Oct 08 2017 *) PROG (PARI) t(m)= { if (m==0, return(a1)); if (m==1, return(a2)); if (m==2, return(a3)); r = a1 + a2 + a3; a1=a2; a2=a3; a3=r; return(r); } { a1=0; a2=1; a3=1; n=0; for (m=0, 1000, a=t(m); if (isprime(a), write("b092836.txt", n++, " ", a))); } \\ Harry J. Smith, Jun 21 2009 CROSSREFS Cf. A000073, A092835, A056816. Sequence in context: A072060 A106912 A099629 * A102152 A102156 A102151 Adjacent sequences:  A092833 A092834 A092835 * A092837 A092838 A092839 KEYWORD nonn AUTHOR Eric W. Weisstein, Mar 06 2004 STATUS approved

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Last modified November 15 06:23 EST 2019. Contains 329144 sequences. (Running on oeis4.)