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.

1, 2, 4216, 44834576

Offset

0,2

Links

Table of n, a(n) for n=0..3.

F. Barnes, Divisors of primitive Pythagorean triangles when the hypotenuse is to a power

Crossrefs

Cf. A066770; A066771; A098918.

Sequence in context: A342295 A114722 A135959 * A178410 A067668 A292391

Adjacent sequences: A105664 A105665 A105666 * A105668 A105669 A105670

Keyword

more,nonn

Author

Lekraj Beedassy, May 04 2005

Status

approved