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mathlove
  • Member for 10 years
  • Last seen more than a week ago
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140
How do people perform mental arithmetic for complicated expressions?
86
Numbers $n$ such that the digit sum of $n^2$ is a square
81
How to prove that the Fibonacci sequence is periodic mod 5 without using induction?
73
Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$
65
Arranging numbers from $1$ to $n$ such that the sum of every two adjacent numbers is a perfect power

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