A074235 - OEIS

A074235

Numbers that cannot be a long leg of an integer right triangle.

1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 17, 18, 19, 22, 23, 25, 26, 27, 29, 31, 33, 34, 37, 38, 39, 41, 43, 46, 47, 49, 50, 51, 53, 54, 57, 58, 59, 61, 62, 65, 66, 67, 69, 71, 73, 74, 78, 79, 81, 82, 83, 85, 86, 87, 89, 93, 94, 95, 97, 98, 101, 102, 103, 106, 107, 109, 111

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OFFSET

1,2

COMMENTS

The possible values of a long leg of an integer right triangle are in A009012.

A227481(a(n)) = 1. - Reinhard Zumkeller, Oct 11 2013

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

EXAMPLE

5 is a term because a^2 + 5^2 = c^2 has no solution for a < 5 with integers a, c.

13 is a term because a^2 + 13^2 = c^2 has no solution for a < 13 with integers a, c.

PROG