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

Offset: 1

Author

Zak Seidov, Sep 18 2002

Keywords

• nonn

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

Examples

			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.
		

Links

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

Crossrefs

Cf. A009012.

Cf. A009023 (complement).

Programs

Haskell

a074235 n = a074235_list !! (n-1)
a074235_list = filter ((== 1) . a227481) [1..]
-- Reinhard Zumkeller, Oct 11 2013