Check if number exists in vector
Largest Twin Primes
Return 'on' or 'off'
Max index of 3D array
Construct the Seidel-Entringer-Arnold triangle
Find pairs of primes with the same digit sum and a specified separation
Identify Wagstaff primes
Iterate the sum of divisors and totient
List composite numbers that cannot be written as the sum of two primes
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