A215782 -id:A215782 - cp's OEIS frontend

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

V. Raman, Aug 29 2012

nonn

Prime numbers that do not divide any term of A000213.

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

Cf. A000213, A046735, A215782.

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

A216438 Odd composite numbers which do not divide any tribonacci number.

Original entry on oeis.org

27, 81, 91, 135, 189, 203, 221, 243, 247, 273, 297, 305, 309, 351, 371, 377, 405, 455, 459, 489, 513, 515, 551, 559, 567, 597, 609, 621, 637, 663, 675, 721, 729, 741, 779, 783, 815, 819, 837, 891, 915, 927, 945, 995, 999, 1001, 1015, 1053, 1079

Offset: 1

V. Raman, Sep 09 2012

nonn

Odd composite numbers that do not divide any term of A000213.

V. Raman, Table of n, a(n) for n = 1..132

Cf. A215782, A000213, A215964.

cp's OEIS Frontend

A215964 Prime tribonacci non-divisors.

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