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

1,2

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

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

Crossrefs

Cf. A009012.

Cf. A009023 (complement).

Sequence in context: A358215 A099308 A359544 * A325366 A192189 A285375

Adjacent sequences: A074232 A074233 A074234 * A074236 A074237 A074238

Keyword

nonn

Author

Zak Seidov, Sep 18 2002

Status

approved