A113238 Differences of nonzero tribonacci numbers.

0, 1, 2, 3, 5, 6, 9, 11, 12, 17, 20, 22, 23, 31, 37, 40, 42, 43, 57, 68, 74, 77, 79, 80, 105, 125, 136, 142, 145, 147, 148, 193, 230, 250, 261, 267, 270, 272, 273, 355, 423, 460, 480, 491, 497, 500, 502, 503, 653, 778, 846, 883, 903, 914, 920, 923, 925, 926, 1201

Offset: 1

Author

Jonathan Vos Post, Oct 19 2005

Keywords

• easy
• nonn

Crossrefs

Cf. A000073, A001590 (subset), A113239 (primes in this sequence).

Programs

Mathematica

Union[Flatten[Differences/@Subsets[Drop[LinearRecurrence[{1, 1, 1}, {0, 0, 1}, 16],2],{2}]]] (* James C. McMahon, Jun 22 2024 *)

Formula

{a(n)} = { A000073(i) - A000073(j) such that i>=j>=2 }.