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A103249 Numbers y, without duplication, in Pythagorean triples x,y,z where x,y,z are relatively prime composite numbers and x is a perfect square. 1
3, 12, 17, 27, 48, 63, 68, 75, 77, 99, 108, 147, 153, 192, 243, 252, 272, 300, 301, 308, 323, 363, 396, 399, 425, 432, 507, 561, 567, 577, 588, 612, 621, 675, 693, 768, 833, 867, 891, 943, 972, 1008, 1023, 1083, 1088, 1200, 1204, 1232, 1292, 1323, 1377, 1377 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
There exists no case in which x and y are both squares.
LINKS
Chenglong Zou, Peter Otzen, Cino Hilliard, Pythagorean triplets, digest of 6 messages in mathfun Yahoo group, Mar 19, 2005.
EXAMPLE
y=3, x=4, 4^2 + 3^2 = 5^2. 3 is the 1st entry in the list.
PROG
(PARI) pythtrisq(n) = { local(a, b, c=0, k, x, y, z, vy, j); w = vector(n*n+1); for(a=1, n, for(b=1, n, x=2*a*b; y=b^2-a^2; z=b^2+a^2; if(y > 0 & issquare(x), c++; w[c]=y; print(x", "y", "z) ) ) ); vy=vector(c); w=vecsort(w); for(j=1, n*n, if(w[j]>0, k++; vy[k]=w[j]; ) ); for(j=1, 200, print1(vy[j]", ") ) }
CROSSREFS
Sequence in context: A136047 A082965 A045549 * A354680 A047906 A342776
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Mar 19 2005
STATUS
approved

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Last modified March 28 07:33 EDT 2024. Contains 371235 sequences. (Running on oeis4.)