A215964 Prime tribonacci non-divisors.

2, 103, 163, 199, 397, 421, 757, 883, 991, 1021, 1087, 1123, 1237, 1543, 1567, 1609, 1753, 1873, 2539, 2731, 2797, 2803, 2953, 3259, 3391, 3433, 3499, 3613, 3631, 3733, 3853, 3877, 3943, 4093, 4591, 4621, 4723, 4789, 4933, 4951, 4987, 4999

Offset

1,1

Comments

Prime numbers that do not divide any term of A000213.

Links

V. Raman and Charles R Greathouse IV, Table of n, a(n) for n = 1..1000 (first 107 terms from Raman)

Project Euler, Problem #225: Tribonacci non-divisors

Prog

(PARI) is(n)=my(a=1, b=1, c=1, t); for(i=1, n^2, t=(a+b+c)%n; if(t, a=b; b=c; c=t, return(0)); if(c==1&&b==1&&a==1, return(isprime(n)))) \\ Charles R Greathouse IV, Aug 29 2012

Crossrefs

Cf. A000213, A046735, A215782.

Sequence in context: A283624 A055693 A357767 * A106299 A176933 A246775

Adjacent sequences: A215961 A215962 A215963 * A215965 A215966 A215967

Keyword

nonn

Author

V. Raman, Aug 29 2012

Status

approved