A351689 a(n) is the number in the first column of the Trithoff (tribonacci) array that starts off the row containing the tail of n times the tribonacci sequence.

1, 14, 21, 176, 220, 264, 308, 352, 2466, 2740, 3014, 3288, 3562, 3836, 4110, 4384, 4658, 4932, 5206, 5480, 5754, 37510, 39215, 40920, 42625, 44330, 46035, 47740, 49445, 51150, 52855, 54560, 56265, 57970, 59675, 61380, 63085, 64790, 66495, 68200, 69905, 71610

Offset

1,2

Comments

The sequence is increasing.

a(n) is divisible by n.

The row number where the tail of n times tribonacci numbers appears in the Trithoff array form sequence A351685.

Links

Table of n, a(n) for n=1..42.

Example

Consider twice the Tribonacci numbers: 0, 0, 2, 2, 4, 8, 14, 26, 48, and so on. The first few terms can be found in the first row of the Trithoff array A136175. The tail starting with 14, 26, and 48 is the seventh row of the Trithoff array. The first number in the seventh row is 14. Thus, a(2) = 14.

Crossrefs

Cf. A000073, A136175, A351685.

Sequence in context: A335760 A159453 A266651 * A166628 A199250 A199195

Adjacent sequences: A351686 A351687 A351688 * A351690 A351691 A351692

Keyword

nonn

Author

Tanya Khovanova and PRIMES STEP Senior group, May 08 2022

Status

approved