I also think "The distribution of the small Gaussian primes in the complex plane" image is neat. https://upload.wikimedia.org/wikipedia/commons/c/c8/Gauss-prim

I also think "The distribution of the small Gaussian primes in the complex plane" image is neat. https://upload.wikimedia.org/wikipedia/commons/c/c8/Gauss-primes-768x768.png https://upload.wikimedia.org/wikipedia/commons/c/c8/Gauss-pr... ( linked from: https://en.wikipedia.org/wiki/Gaussian_integer#Unsolved_problems https://en.wikipedia.org/wiki/Gaussian_integer#Unsolved_prob... ) If you load that into MS Paint and use the fill tool with black color, all that remains are a few white dots. Diagonally, counting from zero at the center, there is a line with white pixels at 2, 5, 25, 30, 35, 70... which is https://oeis.org/A109306 https://oeis.org/A109306