A196379 Positive integers a for which there is a primitive (-4)-Pythagorean triple (a,b,c) satisfying a<=b.

1, 3, 4, 4, 5, 5, 7, 7, 8, 8, 9, 11, 11, 12, 12, 13, 13, 15, 15, 16, 16, 17, 17, 19, 19, 20, 20, 20, 20, 21, 21, 23, 23, 24, 24, 25, 28, 28, 28, 28, 29, 31, 32, 32, 33, 35, 35, 35, 36, 37, 39, 40, 40, 40, 44, 44, 44, 45, 48, 51, 52, 52, 52, 55, 55, 56, 56

Offset: 1

Author

Clark Kimberling, Oct 01 2011

Keywords

• nonn

Comments

See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences.

Examples

			Primitive (-4)-Pythagorean triples a,b,c;
c^2=a^2+b^2+k*a*b, where k=-4:
1,4,1
3,20,13
4,15,1
4,21,11
5,24,11
5,48,37
7,40,23
7,88,73
8,35,13
8,65,47
		

Crossrefs

Cf. A195770, A196376, A196380, A196381.

Programs

Mathematica

(See A196376.)