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123456 Triangle (Posted on 2023-10-28) Difficulty: 3 of 5
Find all integer-sided triangles (a,b,c), where each side is a permutation of N=123456, and the area is an integer.

List your triangles with a<b<c

No Solution Yet Submitted by K Sengupta    
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Solution Computer solution Comment 1 of 1
I found 481 such triangles.
Since the problem states a<b<c, I did not account for any possible isosceles triangles.
I used Heron's formula to calculate area, and accounted for potential rounding errors.  Hopefully this did not add any spurious results.
-----------------------
def areaHeron(a,b,c):
    """ input 3 float numbers, the 3 sides of a triangle
    output the area """
    if c >= a+b or b >= a+c or a >= b+c:
        return 0
    s = (a+b+c)/2  # semiperimeter
    return (s*(s-a)*(s-b)*(s-c))**(1/2)

triangles = []
perms1to6 = []
from itertools import permutations
from itertools import combinations
for p in permutations('123456'):
    perms1to6.append(int(''.join(p)))
perms1to6 = sorted(perms1to6)

for comb in combinations(perms1to6,3):
    if comb[2] < comb[1] or comb[1] < comb[0]:
        continue
    area = areaHeron(comb[0],comb[1],comb[2])
    if area <= 0:
        continue
    if abs(round(area) - area) < .000001:
        print(list(comb) + [area])
        triangles.append(list(comb) + [area])

-----------------------

[123546, 436215, 451236, 26941974636.0]
[123564, 146235, 234615, 7777227827.000001]
[124356, 265431, 326154, 15691457777.0]
[124536, 135426, 152364, 8002629311.999999]
[124536, 163245, 235164, 9619161368.0]
[124563, 342516, 465231, 4265134651.000001]
[125346, 425316, 526413, 17477529162.0]
[125634, 451236, 546123, 20367824039.0]
[126435, 651423, 653241, 41040449995.0]
[126543, 541326, 635241, 24802092261.0]
[132564, 456312, 541632, 25088012410.0]
[132645, 546312, 654312, 22973813356.0]
[132654, 261345, 326154, 16560974829.0]
[134256, 513462, 561423, 33432967579.0]
[134526, 451236, 513246, 28504009008.0]
[134652, 521643, 635124, 20817876349.0]
[134652, 523146, 532416, 35159469985.0]
[135246, 421536, 453612, 28400483088.0]
[136245, 312564, 412653, 16461093706.0]
[136452, 513462, 612534, 26218119928.0]
[136542, 264531, 341256, 16665263816.0]
[142365, 253164, 256431, 17410386418.0]
[142536, 246513, 346512, 14617129347.0]
[143256, 214356, 254613, 15348396380.0]
[143526, 612354, 635412, 43896852684.0]
[143562, 312465, 341265, 22424622228.0]
[145236, 146235, 264513, 8095784025.0]
[145362, 436512, 532461, 26152796483.0]
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[145632, 413526, 531264, 20002864224.0]
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[152346, 561342, 562341, 42401084558.0]
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[152436, 615423, 621543, 46742507231.0]
[152463, 263415, 351462, 18535865115.0]
[153246, 256143, 314652, 19469372898.0]
[153264, 615432, 651432, 46836531352.0]
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[153624, 431652, 512436, 30429614166.0]
[153624, 526134, 526341, 39988398832.0]
[153624, 531642, 613542, 36874133253.0]
[154236, 254316, 326154, 19094332956.0]
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[163452, 641523, 653214, 52349123427.0]
[164235, 231654, 325461, 17941587387.0]
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[164253, 251643, 324516, 20323146917.0]
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[165342, 245163, 324165, 19782272543.0]
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[213564, 243516, 246153, 23524570475.0]
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[214365, 532146, 532641, 55894754052.0]
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[246513, 624315, 652143, 76691582350.0]
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[246531, 264351, 356214, 32571720754.0]
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  Posted by Larry on 2023-10-28 14:07:11
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