What else is out there?
Jeserac sat motionless within a whirlpool of numbers. The first thousand primes... Jeserac was no mathematician, though sometimes he liked to believe he was. All he could do was to search among the infinite array of primes for special relationships and rules which more talented men might incorporate in general laws. He could find how numbers behaved, but he could not explain why. It was his pleasure to hack his way through the arithmetical jungle, and sometimes he discovered wonders that more skillful explorers had missed. He set up the matrix of all possible integers, and started his computer stringing the primes across its surface as beads might be arranged at the intersections of a mesh.
Arthur C. Clarke, The City and the Stars (1956, Ch. 6, p. 54)
Robert Sacks, Number Spiral
Prime Sieve Links
Interesting geometric interpretation of the Sieve of Eratosthenes: