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Numbers which are the sides that belong to only one primitive Pythagorean triangle.
1

%I #14 Nov 21 2014 02:19:19

%S 3,4,7,8,9,11,16,19,23,27,31,32,43,47,49,59,64,67,71,79,81,83,103,107,

%T 121,127,128,131,139,151,163,167,179,191,199,211,223,227,239,243,251,

%U 256,263,271,283,307,311,331,343,347,359,361,367,379,383,419,431,439

%N Numbers which are the sides that belong to only one primitive Pythagorean triangle.

%C Powers of 2 starting with 2^2=4 and powers of primes of form 4k+3; none is a hypotenuse. - _Ray Chandler_, Jul 21 2005

%C Along with 2, the natural numbers that are Gaussian prime powers. _Morgan L. Owens_, Nov 21 2014

%Y Cf. A024357, A024363, A110134, A002145

%K nonn

%O 1,1

%A _Lekraj Beedassy_, Jul 13 2005

%E Extended by _Ray Chandler_, Jul 21 2005