A108616 - OEIS

A108616

3-column rectangular array of near-right obtuse triangles.

4, 8, 9, 6, 18, 19, 8, 32, 33, 18, 30, 35, 10, 50, 51, 22, 46, 51, 34, 38, 51, 12, 72, 73, 28, 76, 81, 44, 68, 81, 14, 98, 99, 32, 100, 105, 68, 80, 105, 16, 128, 129, 64, 112, 129, 38, 142, 147, 60, 132, 145, 18, 162, 163, 82, 122, 147, 72, 144, 161, 42, 174, 179

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

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..62.

FORMULA

Row n is the n-th triple (a, b, c), in order of increasing perimeter a+b+c and increasing a, such that a < b < c and a^2 + b^2 - c^2 = -1.

EXAMPLE

First two triples:

4,8,9 (a + b + c = 21; 16 + 64 - 81 = -1)

6,18,19 (a + b + c = 43; 36 + 324 - 361 = -1)

CROSSREFS