532771domain: NPropertiesPrimalityPrimeyesAppears in sequencesC(2n-1,n-1) mod n^4.at n=31A099908Number of length n 1..(2+2) arrays with no leading partial sum equal to a prime and no consecutive values equal.at n=20A255710a(n) = binomial(2*c-1, c-1) (mod c^4), where c is the n-th composite number.at n=19A298946Prime numbersat n=44036