First 11 values of A121387 coincide with apparently unrelated new seq

[Ray Chandler]

> The open issue being the multiplicity of such
> solutions. The table I gave in seqfans through n=41
> shows a number of double solutions, i.e. semiprime
> Pythagorean triple hypotenuses in two different ways. 
> 
> 
> What is the first triple solution?  
> 
> Perhaps I should make a seq of the first k-tuple
> solution of semiprime Pythagorean triple hypotenuses. 
> Or pehaps not.  Thought and feelings?
> 

See formula (24) in the MathWorld article on Pythagorean Triples - 
http://mathworld.wolfram.com/PythagoreanTriple.html

The number of ways a semiprime can be the hypotenuse of a primitive right triangle is one if the semiprime is of the
form p^2 and two if the semiprime is of the form p*q with p,q distinct primes.  There can be no higher number of ways
for a semiprime.

You missed one of the ways for 65 - (33,56,65)
Ray