194841domain: NAppears in sequencesDivisors of 10^11 - 1.at n=5A027896Numbers n (relatively prime to 10) such that the decimal form of the period of 1/n is prime.at n=17A175545Numbers n dividing every cyclic permutation of n^2.at n=27A178028Numbers n dividing every cyclic permutation of n^4.at n=40A242740