A231575 Indices of prime tribonacci numbers (A001590).

4, 5, 7, 9, 25, 29, 49, 79, 1613, 15205

Offset

1,1

Comments

a(11) > 2*10^5.

Links

Table of n, a(n) for n=1..10.

Prog

(PARI) v=[1, 0, 1]; for(n=4, 1e4, if(ispseudoprime(t=v[1]+v[2]+v[3]), print1(n", ")); v=[v[2], v[3], t]) \\ Charles R Greathouse IV, Nov 18 2013

Crossrefs

Cf. A001590, A231574, A000213, A056816, A157611.

Sequence in context: A234257 A278335 A243300 * A335001 A368659 A153085

Adjacent sequences: A231572 A231573 A231574 * A231576 A231577 A231578

Keyword

nonn

Author

Robert Price, Nov 18 2013

Status

approved