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  3. Project Euler #42: Coded triangle numbers
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Project Euler #42: Coded triangle numbers

  • Venkateshgurram5
     + 0 comments

    Easy solution in Python 3

    t=int(input().strip())
for _ in range(t):
    tn=int(input().strip())
    a=((1+8*tn)**0.5-1)/2
    if a==int(a):
        print(int(a))
    else:
        print(-1)