A375474 Numbers k such that k is the area of a rational isosceles triangle.
3, 7, 10, 11, 12, 14, 15, 17, 19, 23, 26, 27, 28, 30, 31, 35, 39, 40, 42, 43, 44, 46, 47, 48, 51, 55, 56, 58, 59, 60, 62, 63, 67, 68, 69, 71, 74, 75, 76, 77, 78, 79, 82, 83, 87, 90, 91, 92, 94, 95, 97, 99, 103, 104, 105, 106, 107, 108, 110, 111, 112, 113, 115, 119, 120, 122, 123
Offset: 1
Keywords
Examples
12 is the area of an isosceles triangle with sides (5, 5, 6). 40 is the area of an isosceles triangle with sides (12, 82/3, 82/3).
Links
- Frank M Jackson, Table of n, a(n) for n = 1..2895
Programs
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Mathematica
lst=Last/@ReadList["https://oeis.org/A375017/b375017.txt", {Number, Number}]; dmax=75; Select[(Sort@Flatten@Table[Table[lst[[n]]*d^2, {d, 1, dmax}], {n, 1, Length@lst}]), #<=140 &]
Comments