357271domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are a concatenation of 3, 5, 7 and a prime.at n=20A101252Number of (n+1) X (1+1) 0..2 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.at n=11A251130Prime numbersat n=30543