Finding Perfect Squares
Sum the entries of each column of a matrix which satisfy a logical condition.
Magic is simple (for beginners)
ZigZag matrix with reflected format
Factorions: Numbers that equal the sum of the factorials of their digits
Construct a continued fraction for a square root
Compute an integral of an exponential function
Compute the Euler totient function
Find pairs of primes with the same digit sum and a specified separation
Eliminate redundant numbers in text
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