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A120212
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"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.).
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4
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008, p. 47.
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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
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CROSSREFS
| Sequence in context: A153309 A047486 A191257 * A093670 A185011 A175144
Adjacent sequences: A120209 A120210 A120211 * A120213 A120214 A120215
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KEYWORD
| nonn,changed
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AUTHOR
| Giorgio Balzarotti, Paolo P. Lava (greenblue(AT)tiscali.it), Jun 10 2006
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