A362873 -id:A362873

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Search: a362873 -id:a362873

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A375996

Number of integers y > 0 such that y < (n/2+x)*sqrt(3) and y < (n/2-x)*sqrt(3),

+10
0

0, 1, 2, 5, 8, 13, 18, 24, 31, 38, 47, 56, 67, 78, 90, 103, 116, 131, 146, 163, 180, 199, 217, 238, 257, 280, 301, 326, 349, 375, 400, 427, 454, 483, 512, 543, 574, 606, 639, 672, 707, 742, 779, 816, 854, 893, 932, 973, 1014, 1057, 1100, 1145, 1189, 1236, 1281

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Also number of integer coordinates of points inside an equilateral triangle with side length n, where one vertex is on the y-axis (Oy) and the other two vertices are on the x-axis (Ox).

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Cf. A362873.

KEYWORD

nonn

AUTHOR

Jean-Marc Rebert, Sep 05 2024

STATUS

approved

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