

A353178


The row numbers of the Trithoff (tribonacci) array that correspond to difference sequences of other rows of the Trithoff array.


2



2, 3, 4, 7, 11, 12, 16, 17, 19, 20, 21, 25, 26, 28, 29, 30, 33, 34, 35, 38, 42, 43, 45, 46, 47, 50, 51, 52, 55, 59, 60, 61, 64, 68, 69, 73, 74, 76, 77, 78, 81, 82, 83, 86, 90, 91, 92, 95, 99, 100, 104, 105, 107, 108, 109, 112, 116, 117, 121, 122, 124, 125, 126, 130, 131
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OFFSET

1,1


COMMENTS

All positive tribonaccilike sequences are in the Trithoff array.
Every tribonaccilike sequence s is a difference sequence of another tribonaccilike sequence t, where t is uniquely defined. If s is an integer sequence then, t doesn't have to be an integer sequence. If t is an integer sequence, then the row number corresponding to sequence s is in this sequence.
These are the Trithoff array rows that are all odd, or all even, or alternate between even and odd.


LINKS



EXAMPLE

The first row of the Trithoff array is the sequence of tribonacci numbers A000073. Its differences form sequence A001590, which is the second row of the Trithoff array. Thus, 2 is in this sequence.
The tribonacci sequence, the first row of the Trithoff array, is the difference sequence of the tribonaccilike sequence A000213 divided by 2. The result is not an integer sequence. Thus, 1 is not in this sequence.


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



