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 A120569 Number of isosceles triangles with integer sides and inradius n. 1
 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 3, 0, 0, 2, 1, 0, 1, 0, 2, 2, 0, 0, 5, 0, 0, 1, 1, 0, 3, 0, 1, 1, 0, 1, 4, 0, 0, 1, 3, 0, 3, 0, 1, 2, 0, 0, 5, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 8, 0, 0, 3, 1, 0, 1, 0, 1, 1, 2, 0, 6, 0, 0, 2, 1, 0, 2, 0, 3, 1, 0, 0, 6, 0, 0, 1, 1, 0, 4, 0, 1, 1, 0, 0, 5, 0, 0, 2, 2, 0, 1, 0, 1, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,12 REFERENCES Mohammad K. Azarian, Circumradius and Inradius, Problem S125, Math Horizons, Vol. 15, Issue 4, April 2008, p. 32.  Solution published in Vol. 16, Issue 2, November 2008, p. 32. LINKS David W. Wilson, Table of n, a(n) for n = 1..10000 EXAMPLE a(24) = 5 because 5 integer-sided isosceles triangles, namely (a,b,c) = (80,80,96), (80,85,85), (90,90,144), (130,130,240), (175,175,336), have inradius 24. CROSSREFS See A120062 for sequences related to integer-sided triangles with integer inradius n. Sequence in context: A115979 A067168 A099475 * A128113 A108930 A059682 Adjacent sequences:  A120566 A120567 A120568 * A120570 A120571 A120572 KEYWORD nonn AUTHOR David W. Wilson, Jun 17 2006 STATUS approved

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Last modified May 12 23:09 EDT 2021. Contains 343829 sequences. (Running on oeis4.)