A338780 a(n) is the square root of Sum_{k = 1..A338774(n)} A338774(n - k).

0, 0, 1, 0, 0, 2, 3, 0, 0, 4, 5, 0, 0, 6, 7, 0, 0, 8, 9, 8, 0, 0, 3, 2, 0, 0, 10, 0, 0, 10, 12, 0, 0, 13, 14, 13, 12, 4, 13, 6, 17, 18, 19, 20, 0, 0, 21, 22, 0, 0, 23, 24, 0, 0, 25, 26, 21, 4, 13, 0, 0, 15, 21, 26, 26, 27, 30, 31, 32, 33, 32, 32, 35, 26, 24

Offset

1,6

Comments

Runs of consecutive zeros have always length 2.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program for A338780

Example

For n = 3:
- A338774(3) = 2,
- so a(3)^2 = A338774(3-1) + A338774(3-2) = 1 + 0 = 1,
- and a(3) = 1.

Prog

(PARI) See Links section.

Crossrefs

Cf. A338774.

Sequence in context: A097027 A072741 A131360 * A213714 A242011 A353612

Adjacent sequences: A338777 A338778 A338779 * A338781 A338782 A338783

Keyword

nonn

Author

Rémy Sigrist, Nov 08 2020

Status

approved