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 A024360 Number of primitive Pythagorean triangles with long leg n. 4
 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,420 COMMENTS Consider primitive Pythagorean triangles (A^2 + B^2 = C^2, (A, B) = 1, A <= B); sequence gives number of times B takes value n. Number of times n occurs in A020883. LINKS Ray Chandler, Table of n, a(n) for n = 1..10000 Ron Knott, Pythagorean Triples and Online Calculators FORMULA a(n) = A024361(n) - A024359(n). - Ray Chandler, Feb 03 2020 MATHEMATICA A[s_] := With[{s6 = StringPadLeft[ToString[s], 6, "0"]}, Cases[Import[ "https://oeis.org/A" <> s6 <> "/b" <> s6 <> ".txt", "Table"], {_, _}][[;; 10000, 2]]]; A@024361 - A@024359 (* Jean-François Alcover, Mar 27 2020 *) CROSSREFS Cf. A020883, A024359, A024361. Sequence in context: A340599 A160753 A328981 * A025456 A288314 A285963 Adjacent sequences: A024357 A024358 A024359 * A024361 A024362 A024363 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified June 9 07:14 EDT 2023. Contains 363168 sequences. (Running on oeis4.)