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 A306991 Number of primitive Heronian isosceles triangles with perimeter A308222(n). 0
 1, 1, 1, 2, 2, 3, 2, 2, 3, 3, 5, 4, 3, 6, 4, 4, 5, 4, 8, 6, 9, 6, 6, 4, 8, 11, 8, 10, 6, 9, 9, 8, 14, 6, 15, 10, 11, 10, 8, 12, 10, 12, 18, 9, 12, 12, 20, 14, 8, 21, 15, 12, 16, 10, 23, 16, 21, 12, 12, 16, 18, 26, 18, 20, 12, 16, 18, 20, 29, 12, 21, 30 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Records occur at indices of 1, 4, 6, 11, 14, 19, 21, 26, 33, 35, ... corresponding to perimeters of 16, 50, 98, 242, 338, 578, 722, 1058, 1682, 1922, ... LINKS Table of n, a(n) for n=1..72. EXAMPLE For n = 6, the a(6) = 3 primitive Heronian isosceles triangles with perimeter A308222(6) = 98 have side lengths (24,37,37), (25,25,48), and (29,29,40), and areas of 420, 168, and 420 respectively. CROSSREFS Cf. A298614, A305717, A308222. Sequence in context: A330623 A153095 A254574 * A239585 A321788 A182093 Adjacent sequences: A306988 A306989 A306990 * A306992 A306993 A306994 KEYWORD nonn AUTHOR Peter Kagey, May 18 2019 STATUS approved

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Last modified April 18 10:01 EDT 2024. Contains 371779 sequences. (Running on oeis4.)