Reference: numberVector
If v is a N-dimensional vector and a an integer, then numberVector(v, a) returns a N×2 matrix where the first element of the nth row (indexed from 0) is n + a and the second element is v_(n + 1). numberVector(v) = numberVector(v, 0). Example: primes ≔ sieveOfEratosthenes(10) numberVector(primes)