

A120212


"a" values providing solution x = b in A120211 (i.e., y^2 = b^2*(a^2  b)*(b + 1) with a, b legs in primitive Pythagorean triangles).


3



3, 5, 7, 8, 9, 11, 13, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75
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OFFSET

1,1


REFERENCES

G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008, p. 47.


LINKS

Table of n, a(n) for n=1..37.


EXAMPLE

First primitive Pythagorean triad: 3, 4, 5.
Weierstrass equation: y^2 = x*(3^2  x)*(4^2 + x).
Smallest integer solution: (x, y) = (4,20).
As x = b, the first element in the sequence is a = 3.


CROSSREFS

Sequence in context: A047486 A229838 A191257 * A093670 A185011 A175144
Adjacent sequences: A120209 A120210 A120211 * A120213 A120214 A120215


KEYWORD

nonn


AUTHOR

Giorgio Balzarotti, Paolo P. Lava, Jun 10 2006


STATUS

approved



