login
a(n) = Prime(tribonacci(n)).
1

%I #8 Jul 13 2021 01:22:14

%S 2,2,3,7,17,41,89,193,419,859,1759,3607,7247,14551,28793,56893,111863,

%T 218839,426583,827851,1603769,3097121,5966629,11470489,22004617,

%U 42142883,80570929,153802489,293176621,558130051,1061238359,2015569583

%N a(n) = Prime(tribonacci(n)).

%C This is to the tribonacci sequence what A030427 is to the Fibonacci sequence.

%H Chai Wah Wu, <a href="/A113842/b113842.txt">Table of n, a(n) for n = 2..68</a>

%F a(n) = A000040(A000073(n)).

%e a(2) = prime(tribonacci(2)) = prime(1) = 2.

%e a(3) = prime(tribonacci(3)) = prime(1) = 2.

%e a(4) = prime(tribonacci(4)) = prime(2) = 3.

%e a(5) = prime(tribonacci(5)) = prime(4) = 7.

%e a(6) = prime(tribonacci(6)) = prime(7) = 17.

%Y Cf. A000040, A000073, A030427.

%K easy,nonn

%O 2,1

%A _Jonathan Vos Post_, Jan 23 2006