A353083 The second column of the Trithoff (tribonacci) array.

2, 6, 9, 15, 19, 22, 26, 30, 33, 39, 43, 46, 50, 53, 59, 63, 66, 70, 74, 77, 83, 87, 90, 96, 100, 103, 107, 111, 114, 120, 124, 127, 131, 134, 140, 144, 147, 151, 155, 158, 164, 168, 171, 175, 179, 182, 188, 192, 195, 199, 202, 208, 212, 215, 219, 223, 226

Offset: 1

Author

Tanya Khovanova and PRIMES STEP Senior group, Apr 22 2022

Keywords

• nonn

Comments

These are the numbers whose tribonacci representation ends in 10.

This is a subsequence of A003145: Numbers in this sequence indicate positions of letter b in the tribonacci word, but not all such positions.

Examples

			The first few tribonacci numbers are 1, 2, 4, 7, 13, 24. The number 43 can be represented as 24+13+4+2. Thus, its tribonacci representation is 110110, and 43 is in this sequence.
		

Crossrefs

Cf. A000073, A003145, A003265, A136175, A353084, A353086, A353090.