362081domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of forests of rooted trees containing n nodes not counting the root nodes.at n=14A181360Least prime p such that p*10^n-1, p*10^n-3, p*10^n-7 and p*10^n-9 are all prime.at n=17A243411Prime numbersat n=30911