A196172 - OEIS

%I #5 Mar 30 2012 18:57:49

%S 1,1,3,3,5,5,5,7,7,7,7,7,8,8,8,8,9,9,11,11,11,11,13,13,13,13,16,16,16,

%T 16,17,17,17,17,19,19,19,19,21,23,23,23,24,24,25,29,29,31,31,32,32,32,

%U 32,33,35,37,39,40,40,41,43,45

%N Positive integers a for which there is a primitive 7-Pythagorean triple (a,b,c) satisfying a<=b.

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

%e Primitive 7-Pythagorean triples a,b,c;

%e c^2=a^2+b^2+7a*b:

%e 1,1,3

%e 1,8,11

%e 3,11,19

%e 3,91,101

%e 5,16,29

%e 5,77,93

%e 5,264,281

%e 7,16,33

%e 7,39,59

%e 7,87,109

%t (See A196169.)

%Y Cf. A195770, A196169, A196173, A196174.

%K nonn

%O 1,3

%A _Clark Kimberling_, Sep 29 2011