474983domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of iterations to reach a final state for an n X n lattice of sandpiles on a torus according to rules specified in the comment section.at n=25A249872Prime-indexed primes p such that 2*p + 1 is also a prime-indexed prime.at n=37A318294Prime numbersat n=39619