A105667 - cp's OEIS frontend

A105667 1/(2k)-th of area of primitive Pythagorean triangle with hypotenuse 5^(2^n), where k is the product of all Mersenne primes not exceeding 2^(n+2) - 1.

%I A105667 #8 Dec 12 2013 14:41:50
%S A105667 1,2,4216,44834576
%N A105667 1/(2k)-th of area of primitive Pythagorean triangle with hypotenuse 5^(2^n), where k is the product of all Mersenne primes not exceeding 2^(n+2) - 1.
%H A105667 F. Barnes, <a href="http://www.geocities.ws/fredlb37/node6.html">Divisors of primitive Pythagorean triangles when the hypotenuse is to a power</a>
%Y A105667 Cf. A066770; A066771; A098918.
%K A105667 more,nonn
%O A105667 0,2
%A A105667 _Lekraj Beedassy_, May 04 2005

cp's OEIS Frontend

A105667 1/(2k)-th of area of primitive Pythagorean triangle with hypotenuse 5^(2^n), where k is the product of all Mersenne primes not exceeding 2^(n+2) - 1.